Overriding Variables - ONEDOUBT.COM

AI
- ML Intro
- ML and AI
- ML in JavaScript
- ML Examples
- ML Linear Graphs
- ML Scatter Plots
- ML Perceptrons
- ML Recognition
- ML Training
- ML Testing
- ML Learning
- ML Terminology
- ML Data
- ML Clustering
- ML Regressions
- ML Deep Learning
- ML Brain.js
- TFJS Tutorial
- TFJS Operations
- TFJS Models
- TFJS Visor
- Ex1 Intro
- Ex1 Data
- Ex1 Model
- Ex1 Training
- Ex2 Intro
- Ex2 Data
- Ex2 Model
- Ex2 Training
- Graph Intro
- Graph Canvas
- Graph Plotly.js
- Graph Chart.js
- Graph Google
- Graph D3.js
- History of Intelligence
- History of Languages
- History of Numbers
- History of Computing
- History of Robots
- History of AI
- Job Replacements
- Theory of Mind
- Mathematics
- Linear Functions
- Linear Algebra
- Vectors
- Matrices
- Tensors
- Statistics
- Descriptive
- Variability
- Distribution
- Probability
AngularJS
- AngularJS HOME
- AngularJS Intro
- AngularJS Expressions
- AngularJS Modules
- AngularJS Directives
- AngularJS Model
- AngularJS Data Binding
- AngularJS Controllers
- AngularJS Scopes
- AngularJS Filters
- AngularJS Services
- AngularJS Http
- AngularJS Tables
- AngularJS Select
- AngularJS SQL
- AngularJS DOM
- AngularJS Events
- AngularJS Forms
- AngularJS Validation
- AngularJS API
- AngularJS W3.CSS
- AngularJS Includes
- AngularJS Animations
- AngularJS Routing
- AngularJS Application
- AngularJS Examples
- AngularJS Reference
Arduino Projects
- How HC-SR04 Ultrasonic Sensor Works & Interface It With Arduino
- How HC-SR501 PIR Sensor Works & Interface It With Arduino
- Interfacing DHT11 and DHT22 Sensors with Arduino
- Interface DHT11 Module With Arduino
- Interfacing AM2320 Temperature & Humidity Sensor with Arduino
- Interfacing LM35 Temperature Sensor with Arduino
- How MQ2 Gas/Smoke Sensor Works? & Interface it with Arduino
- How MQ3 Alcohol Sensor Works? & Interface it with Arduino
- How RCWL-0516 Microwave Radar Motion Sensor Works & Interface It With Arduino
- Interfacing DS18B20 1-Wire Digital Temperature Sensor with Arduino
- Interfacing Multiple DS18B20 Digital Temperature Sensors with Arduino
- Interfacing MAX6675 Thermocouple Module with Arduino
- Interfacing SHT31 Temperature & Humidity Sensor with Arduino
- Interfacing HTU21D Temperature & Humidity Sensor with Arduino
- Interfacing Reed Switch with Arduino
- Interfacing Ball Tilt Switch Sensor with Arduino
- Interfacing Soil NPK Sensor with Arduino
- How Soil Moisture Sensor Works and Interface it with Arduino
- Interfacing Capacitive Soil Moisture Sensor with Arduino
- Interfacing MAX4466 Microphone Amplifier Module with Arduino
- Interface Sound Sensor with Arduino and Control Devices With a Clap
- How Water Level Sensor Works and Interface it with Arduino
- How Rain Sensor Works and Interface it with Arduino
- Interfacing Force Sensing Resistor (FSR) with Arduino
- Interfacing Flex Sensor with Arduino
- Monitor the Heart Rate using Pulse Sensor and Arduino
- Interfacing MAX30100 Pulse Oximeter and Heart Rate Sensor with Arduino
- Interfacing MAX30102 Pulse Oximeter and Heart Rate Sensor with Arduino
- Interface BMP180 Barometric Pressure & Temperature Sensor with Arduino
- Interface BME280 Temperature, Humidity & Pressure Sensor with Arduino
- Interface BME680 Environmental Sensor with Arduino
- Interfacing BMP388 Barometric Pressure Sensor (Altimeter) with Arduino
- Interfacing MS5611 Barometric Pressure Sensor with Arduino
- Interfacing TMP36 Temperature Sensor with Arduino
- Interface MLX90614 Non-contact Infrared Temperature Sensor with Arduino
- What is RFID? How It Works? Interface RC522 RFID Module with Arduino
- Interfacing TCS230/TCS3200 Color Sensor with Arduino
- How Accelerometer works? Interface ADXL335 with Arduino
- Interface MPU6050 Accelerometer and Gyroscope Sensor with Arduino
- Interfacing TFMini-S LiDAR Sensor with Arduino
- Interface DS1307 RTC Module with Arduino
- Interface DS3231 Precision RTC Module with Arduino
- Interface One Channel Relay Module with Arduino
- Interface Two Channel Relay Module with Arduino
- Interface 4×3 & 4×4 Membrane Keypad with Arduino
- How Rotary Encoder Works and Interface It with Arduino
- How 74HC595 Shift Register Works & Interface it with Arduino
- How 2-Axis Joystick Works & Interface with Arduino + Processing
ASP
- ASP HOME
- WebPages Intro
- WebPages Razor
- WebPages Layout
- WebPages Folders
- WebPages Global
- WebPages Forms
- WebPages Objects
- WebPages Files
- WebPages Databases
- WebPages Helpers
- WebPages WebGrid
- WebPages Charts
- WebPages Email
- WebPages Security
- WebPages Publish
- WebPages Examples
- WebPages Classes
- Razor Intro
- Razor Syntax
- Razor C# Variables
- Razor C# Loops
- Razor C# Logic
- Razor VB Variables
- Razor VB Loops
- Razor VB Logic
- ASP Intro
- ASP Syntax
- ASP Variables
- ASP Procedures
- ASP Conditionals
- ASP Looping
- ASP Forms
- ASP Cookies
- ASP Session
- ASP Application
- ASP #include
- ASP Global.asa
- ASP AJAX
- ASP e-mail
- ASP Examples
- ASP VB Functions
- ASP VB Keywords
- ASP Response
- ASP Request
- ASP Application
- ASP Session
- ASP Server
- ASP Error
- ASP FileSystem
- ASP TextStream
- ASP Drive
- ASP File
- ASP Folder
- ASP Dictionary
- ASP AdRotator
- ASP BrowserCap
- ASP Content Linking
- ASP Content Rotator
- ASP Quick Ref
- ADO Intro
- ADO Connect
- ADO Recordset
- ADO Display
- ADO Query
- ADO Sort
- ADO Add
- ADO Update
- ADO Delete
- ADO Command
- ADO Connection
- ADO Error
- ADO Field
- ADO Parameter
- ADO Property
- ADO Record
- ADO Recordset
- ADO Stream
- ADO DataTypes
AWS
- AWS HOME
- AWS Intro
- AWS Cloud Certification
- AWS Get Started
- AWS Cloud Computing
- AWS Cloud Benefits
- AWS EC2 Intro
- AWS EC2 Instance Types
- AWS EC2 Pricing
- AWS EC2 Scaling
- AWS EC2 Auto Scaling
- AWS Elastic Load Balancing
- AWS Messaging
- AWS SNS
- AWS SQS
- AWS Serverless
- AWS Lambda
- AWS Containers
- AWS ECS
- AWS EKS
- AWS Fargate
- AWS First Recap
- AWS Infrastructure
- AWS Regions
- AWS Availability Zones
- AWS Edge Locations
- AWS Provision
- AWS Provision Services
- AWS Elastic Beanstalk
- AWS CloudFormation
- AWS Second Recap
- AWS Networking
- AWS Connectivity
- AWS Subnet and Access
- AWS Global Networking
- AWS Third Recap
- AWS Storage and DBs
- AWS Instance Stores
- AWS EBS
- AWS S3
- AWS EBS vs S3
- AWS Elastic File System
- AWS RDS
- AWS DynamoDB
- AWS DynamoDB vs RDS
- AWS Redshift
- AWS DMS
- AWS Additional DB Services
- AWS Fourth Recap
- AWS Cloud Security
- AWS Shared Responsibility
- AWS User Access
- AWS Organizations
- AWS Cloud Compliance
- AWS DDoS
- AWS Other Services
- AWS Fifth Recap
- AWS Monitoring and Analytics
- AWS CloudWatch
- AWS CloudTrail
- AWS TrustedAdvisor
- AWS Sixth Recap
- AWS Pricing and Support
- AWS Free Tier
- AWS Pricing Models
- AWS Billing Dashboard
- AWS Consolidated Billing
- AWS Budgets
- AWS Cost Explorer
- AWS Support Plans
- AWS Marketplace
- AWS Seventh Recap
- AWS Migration and Innovation
- AWS Cloud Adoption Framework
- AWS Migration Strategies
- AWS Snow Family
- AWS Innovation
- AWS Eight Recap
- AWS Cloud Journey
- AWS Well-Architected Framework
- AWS Cloud Benefits
- AWS Ninth Recap
- AWS Exam Preparation
- AWS Cloud Exercises
- AWS Cloud Quiz
- Python Apps on AWS
- DevOps on AWS
- AWS Machine Learning
- AWS Serverless
Basic Electronics
- Semiconductor Basics
- PN Junction Diode
- The Half-Wave Rectifier
- The Full-Wave Rectifier
- The Full-Wave Bridge Rectifier
- The Zener Diode
- Light Emitting Diode (LED)
C
- C HOME
- C Intro
- C Get Started
- C Syntax
- C Output
- Print Text
- New Lines
- C Comments
- C Variables
- C Data Types
- Data Types
- Type Conversion
- C Constants
- C Operators
- C Booleans
- C If...Else
- C If...Else
- C Short Hand If
- C Switch
- C While Loop
- C For Loop
- C Break/Continue
- C Arrays
- Arrays
- Multidimensional Arrays
- C Strings
- Strings
- Special Characters
- String Functions
- C User Input
- C Memory Address
- C Pointers
- Pointers
- Pointers & Arrays
- C Functions
- C Function Parameters
- C Function Declaration
- C Recursion
- C Math Functions
- C Create Files
- C Write To Files
- C Read Files
- C Structures
- C Enums
- C Examples
- C Exercises
- C Quiz
- C Compiler
C#
- C# HOME
- C# Intro
- C# Get Started
- C# Syntax
- C# Output
- C# Comments
- C# Variables
- Variables
- Constants
- Display Variables
- Multiple Variables
- Identifiers
- C# Data Types
- C# Type Casting
- C# User Input
- C# Operators
- Arithmetic
- Assignment
- Comparison
- Logical
- C# Math
- C# Strings
- Strings
- Concatenation
- Interpolation
- Access Strings
- Special Characters
- C# Booleans
- C# If...Else
- if
- else
- else if
- Short hand if..else
- C# Switch
- C# While Loop
- C# For Loop
- For loop
- Foreach loop
- C# Break/Continue
- C# Arrays
- Arrays
- Loop through an array
- Sort arrays
- Multidimensional arrays
- C# Methods
- C# Method Parameters
- Parameters & Arguments
- Default Parameter
- Return Values
- Named Arguments
- C# Method Overloading
- C# OOP
- C# Classes/Objects
- Classes and Objects
- Multiple Objects
- C# Class Members
- C# Constructors
- C# Access Modifiers
- C# Properties
- C# Inheritance
- C# Polymorphism
- C# Abstraction
- C# Interface
- Interface
- Multiple Interfaces
- C# Enums
- C# Files
- C# Exceptions
- Add Two Numbers
- C# Examples
- C# Compiler
- C# Exercises
- C# Quiz
- C# Certificate
C++
- C++ HOME
- C++ Intro
- C++ Get Started
- C++ Syntax
- C++ Output
- Print Text
- New Lines
- C++ Comments
- C++ Variables
- Declare Variables
- Declare Multiple Variables
- Identifiers
- Constants
- C++ User Input
- C++ Data Types
- Basic Data Types
- Numbers
- Booleans
- Characters
- Strings
- C++ Operators
- Arithmetic
- Assignment
- Comparison
- Logical
- C++ Strings
- Strings
- Concatenation
- Numbers and Strings
- String Length
- Access Strings
- Special Characters
- User Input Strings
- Omitting Namespace
- C++ Math
- C++ Booleans
- Boolean Values
- Boolean Expressions
- C++ Conditions
- if
- else
- else if
- Short hand if..else
- C++ Switch
- C++ While Loop
- While Loop
- Do/While Loop
- C++ For Loop
- C++ Break/Continue
- C++ Arrays
- Arrays
- Arrays and Loops
- Omit Array Size
- Get Array Size
- Multidimensional Arrays
- C++ Structures
- C++ References
- Create References
- Memory Address
- C++ Pointers
- Create Pointers
- Dereferencing
- Modify Pointers
- C++ Functions
- C++ Function Parameters
- Parameters/Arguments
- Default Parameter
- Multiple Parameters
- Return Values
- Pass By Reference
- Pass Arrays
- C++ Function Overloading
- C++ Recursion
- C++ OOP
- C++ Classes/Objects
- C++ Class Methods
- C++ Constructors
- C++ Access Specifiers
- C++ Encapsulation
- C++ Inheritance
- Inheritance
- Multilevel Inheritance
- Multiple Inheritance
- Access Specifiers
- C++ Polymorphism
- C++ Files
- C++ Exceptions
- Add Two Numbers
- C++ Examples
- C++ Compiler
- C++ Exercises
- C++ Quiz
- C++ Certificate
CSS
- CSS HOME
- CSS Introduction
- CSS Syntax
- CSS Selectors
- CSS How To
- CSS Comments
- CSS Colors
- Colors
- RGB
- HEX
- HSL
- CSS Backgrounds
- Background Color
- Background Image
- Background Repeat
- Background Attachment
- Background Shorthand
- CSS Borders
- Borders
- Border Width
- Border Color
- Border Sides
- Border Shorthand
- Rounded Borders
- CSS Margins
- Margins
- Margin Collapse
- CSS Padding
- CSS Height/Width
- CSS Box Model
- CSS Outline
- Outline
- Outline Width
- Outline Color
- Outline Shorthand
- Outline Offset
- CSS Text
- Text Color
- Text Alignment
- Text Decoration
- Text Transformation
- Text Spacing
- Text Shadow
- CSS Fonts
- Font Family
- Font Web Safe
- Font Fallbacks
- Font Style
- Font Size
- Font Google
- Font Pairings
- Font Shorthand
- CSS Icons
- CSS Links
- CSS Lists
- CSS Tables
- Table Borders
- Table Size
- Table Alignment
- Table Style
- Table Responsive
- CSS Display
- CSS Max-width
- CSS Position
- CSS Z-index
- CSS Overflow
- CSS Float
- Float
- Clear
- Float Examples
- CSS Inline-block
- CSS Align
- CSS Combinators
- CSS Pseudo-class
- CSS Pseudo-element
- CSS Opacity
- CSS Navigation Bar
- Navbar
- Vertical Navbar
- Horizontal Navbar
- CSS Dropdowns
- CSS Image Gallery
- CSS Image Sprites
- CSS Attr Selectors
- CSS Forms
- CSS Counters
- CSS Website Layout
- CSS Units
- CSS Specificity
- CSS !important
- CSS Math Functions
- CSS Rounded Corners
- CSS Border Images
- CSS Backgrounds
- CSS Colors
- CSS Color Keywords
- CSS Gradients
- Linear Gradients
- Radial Gradients
- Conic Gradients
- CSS Shadows
- Shadow Effects
- Box Shadow
- CSS Text Effects
- CSS Web Fonts
- CSS 2D Transforms
- CSS 3D Transforms
- CSS Transitions
- CSS Animations
- CSS Tooltips
- CSS Style Images
- CSS Image Reflection
- CSS object-fit
- CSS object-position
- CSS Masking
- CSS Buttons
- CSS Pagination
- CSS Multiple Columns
- CSS User Interface
- CSS Variables
- The var() Function
- Overriding Variables
- Variables and JavaScript
- Variables in Media Queries
- CSS Box Sizing
- CSS Media Queries
- CSS MQ Examples
- CSS Flexbox
- CSS Flexbox
- CSS Flex Container
- CSS Flex Items
- CSS Flex Responsive
- RWD Intro
- RWD Viewport
- RWD Grid View
- RWD Media Queries
- RWD Images
- RWD Videos
- RWD Frameworks
- RWD Templates
- Grid Intro
- Grid Container
- Grid Item
- SASS Tutorial
- CSS Templates
- CSS Examples
- CSS Editor
- CSS Snippets
- CSS Quiz
- CSS Exercises
- CSS Bootcamp
- CSS Certificate
- CSS Reference
- CSS Selectors
- CSS Functions
- CSS Reference Aural
- CSS Web Safe Fonts
- CSS Animatable
- CSS Units
- CSS PX-EM Converter
- CSS Colors
- CSS Color Values
- CSS Default Values
- CSS Browser Support
Cyber Security
- CS HOME
- CS Cyber Crime
- CS Money Making Threats
- CS Dark Web
- CS Networking Basics
- CS Network Layer
- CS Network Transport
- CS Firewalls
- CS Web Applications
- CS Mapping &Port Scanning
- CS Network Attacks
- CS Web Application Attacks
- CS WIFI Attacks
- CS Penetration Testing &Social Engineering
- CS Passwords
- CS Security Operations
- CS Incident Response
- CS Quiz
- CS Certificate
Data Science
- DS HOME
- DS Introduction
- DS What is Data
- DS Database Table
- DS Python
- DS DataFrame
- DS Functions
- DS Data Preparation
- DS Linear Functions
- DS Plotting Functions
- DS Slope and Intercept
- Stat Introduction
- Stat Percentiles
- Stat Standard Deviation
- Stat Variance
- Stat Correlation
- Stat Correlation Matrix
- Stat Correlation vs Causality
- DS Linear Regression
- DS Regression Table
- DS Regression Info
- DS Regression Coefficients
- DS Regression P-Value
- DS Regression R-Squared
- DS Linear Regression Case
- DS Bootcamp
DBaaS
- Database as a Service
DBReplication
- CSV-Database
- Manage Database In Dbreplication.In
- Set Backup Scheduled in Dbreplication.In
- Set Replication Scheduled in Dbreplication.In
Django
- Django Home
- Django Intro
- Django Get Started
- Create Virtual Environment
- Install Django
- Django Create Project
- Django Create App
- Django Views
- Django URLs
- Django Templates
- Django Models
- Django Insert Data
- Django Update Data
- Django Delete Data
- Django Update Model
- Prepare Template and View
- Add Link to Details
- Add Master Template
- Add Main Index Page
- Django 404 Template
- Add Test View
- Django Admin
- Create User
- Include Models
- Set List Display
- Update Members
- Add Members
- Delete Members
- Django Variables
- Django Tags
- Django If Else
- Django For Loop
- Django Comment
- Django Include
- QuerySet Introduction
- QuerySet Get
- QuerySet Filter
- QuerySet Order By
- Add Static Files
- Install WhiteNoise
- Collect Static Files
- Add Global Static Files
- Add Styles to the Project
- PostgreSQL Intro
- Create AWS Account
- Create Database in RDS
- Connect to Database
- Add Members
- Elastic Beanstalk (EB)
- Create requirements.txt
- Create django.config
- Create .zip File
- Deploy with EB
- Update Project
- Add Slug Field
- Add Bootstrap 5
- Template Tag Reference
- Filter Reference
- Field lookups Reference
- Django Compiler
- Django Exercises
- Django Quiz
- Django Certificate
- Add Main Index Page
- Django Template Variables
- Filter Reference
- Django Variables
- Django Variables
- Django Tags
- Django For Loop
- QuerySet Introduction
- Add Static Files
DS Database Table
- Data Science - Database Table
ESP32 Projects
- Getting Started with ESP32
- ESP32 vs. ESP8266: Which Microcontroller Is Right for You?
- ESP32 Pinout Reference
- ESP32-WROOM-32 Pinout Reference
- ESP32 Basics: Analog-to-digital Converter (ADC)
- ESP32 Basics: Hall Effect Sensor
- ESP32 Basics: Capacitive Touch Pins
- ESP32 Basics: Generating a PWM Signal on the ESP32
- Configuring & Handling ESP32 GPIO Interrupts In Arduino IDE
- Insight Into ESP32 Sleep Modes & Their Power Consumption
- ESP32 Deep Sleep & Its Wake-up Sources
- Create A Simple ESP32 Web Server In Arduino IDE
- How to Create an ESP32 Web Server with WebSockets in Arduino IDE
- ESP32 Basics: Bluetooth Classic
- ESP32 Basics: Bluetooth Low Energy (BLE)
- How to Build a CAN Bus With ESP32
- Create A Simple ESP32 Web Server In Arduino IDE
- Interface DHT11 DHT22 with ESP32 & Display Values Using Web Server
- Create A Simple ESP32 Weather Station With BME280
- Interface Multiple DS18B20s with ESP32 & Display Values Using Web Server
- Getting Started With ESP32-CAM
- ESP32-CAM Pinout Reference
- Control WS2812B Addressable LEDs with ESP32 and WLED
- Getting started with Sound Reactive WLED
- How to Find and Change the MAC Address on ESP32
- How to Solve �A Fatal Error Occurred: Failed to Connect to ESP32: Timed Out Waiting for Packet Header�
- How to set up mDNS on an ESP32
- How to set a Static or Fixed IP Address on your ESP32
- ESP32 Basic Over The Air (OTA) Programming In Arduino IDE
- ESP32 Web Updater Over The Air (OTA) Programming In Arduino IDE
- Getting Date & Time From NTP Server With ESP32
- Interface OLED Graphic Display Module with ESP32
ESP8266 Projects
- Getting Started with ESP8266
- Installing ESP8266 Board in the Arduino IDE
- ESP8266 Pinout Reference
- Create A Simple ESP8266 NodeMCU Web Server In Arduino IDE
- Configuring & Handling ESP8266 GPIO Interrupts In Arduino IDE
- ESP8266 Over The Air (OTA) Programming In Arduino IDE
- Getting Date & Time From NTP Server With ESP8266 NodeMCU
- Control WS2812B Addressable LEDs with ESP8266 and WLED
- Interface DHT11 DHT22 w/ ESP8266 NodeMCU Using Web Server
- How to Use an I2C LCD Display With ESP8266
- Interface OLED Graphic Display Module with ESP8266 NodeMCU
- Display Values of Multiple DS18B20s on ESP8266 NodeMCU Web Server
- Create A Simple ESP8266 Weather Station With BME280
Excel
- Excel HOME
- Excel Introduction
- Excel Get Started
- Excel Overview
- Excel Syntax
- Excel Ranges
- Excel Fill
- Filling
- Double Click to Fill
- Excel Move Cells
- Excel Add Cells
- Excel Delete Cells
- Excel Undo Redo
- Excel Formulas
- Excel Relative Reference
- Excel Absolute Reference
- Excel Arithmetic Operators
- Excel Addition
- Excel Subtraction
- Excel Multiplication
- Excel Division
- Excel Parentheses
- Excel Functions
- Excel Formatting
- Excel Format Painter
- Excel Format Colors
- Excel Format Fonts
- Excel Format Borders
- Excel Format Numbers
- Excel Format Grids
- Excel Format Settings
- Excel Sort
- Excel Filter
- Excel Tables
- Tables
- Table Design
- Table Resizing
- Remove Duplicates
- Convert Table to Range
- Table Style
- Excel Conditional Format
- Excel Highlight Cell Rules
- Highlight Cell Rules
- HCR - Greater Than
- HCR - Less Than
- HCR - Between
- HCR - Equal To
- HCR - Text That Contains
- HCR - Date Occurring
- HCR - Unique Values
- Excel Top Bottom Rules
- Top Bottom Rules
- Above Below Average
- Excel Data Bars
- Excel Color Scales
- Excel Icon Sets
- Excel Manage Rules (CF)
- Excel Charts
- Charts
- Bar Charts
- Stacked Bar Charts
- Column Charts
- Stacked Column Charts
- Pie Charts
- Line Charts
- Stacked Line Charts
- 100% Stacked Line Charts
- Radar Charts
- Excel Charts Customization
- Table Pivot Intro
- Case: Poke Mart
- Case: Poke Mart, Styling
- AND
- AVERAGE
- AVERAGEIF
- AVERAGEIFS
- CONCAT
- COUNT
- COUNTA
- COUNTBLANK
- COUNTIF
- COUNTIFS
- IF
- IFS
- LEFT
- LOWER
- MAX
- MEDIAN
- MIN
- MODE
- NPV
- OR
- RAND
- RIGHT
- STDEV.P
- STDEV.S
- SUM
- SUMIF
- SUMIFS
- TRIM
- VLOOKUP
- XOR
- Convert Time to Seconds
- Difference Between Times
- NPV (Net Present Value)
- Remove Duplicates
- Introduction to Excel
- Learn Data Calculations
- Learn Data Visualization
- Learn to Create a Budget
- Learn to Create a Timeline
- Learn to Style in Excel
- Excel Exercises
- Excel Certificate
- Excel Keyboard Shortcuts
- Excel HOME
- Excel HOME
- Excel Get Started
GIT
- Git HOME
- Git Intro
- Git Get Started
- Git New Files
- Git Staging Environment
- Git Commit
- Git Help
- Git Branch
- Git Branch Merge
- {{title}} Get Started
- {{title}} Edit Code
- Pull from {{title}}
- Push to {{title}}
- {{title}} Branch
- Pull Branch from {{title}}
- Push Branch to {{title}}
- GitHub Flow
- {{title}} Pages
- {{title}} Fork
- Git Clone from {{title}}
- {{title}} Send Pull Request
- Git .gitignore
- Git Security SSH
- {{title}} Add SSH
- Git Revert
- Git Reset
- Git Amend
- Git Exercises
- Git Quiz
- Git Help
GO
- Go Home
- Go Introduction
- Go Get Started
- Go Syntax
- Go Comments
- Go Variables
- Declare Variables
- Declare Multiple Variables
- Naming Rules
- Go Constants
- Go Output
- Output Functions
- Formatting Verbs
- Go Data Types
- Basic Data Types
- Boolean
- Integer
- Float
- String
- Go Arrays
- Go Slices
- Create Slice
- Modify Slice
- Go Operators
- Operators
- Arithmetic
- Assignment
- Comparison
- Logical
- Bitwise
- Go Conditions
- Conditions
- if Statement
- if else Statement
- else if Statement
- Nested if
- Go Switch
- Single-case
- Multi-case
- Go Loops
- Go Functions
- Create/Call Function
- Parameters/Arguments
- Function Returns
- Recursion
- Go Struct
- Go Maps
- Go Exercises
- Go Compiler
HTML
- HTML HOME
- HTML Introduction
- HTML Editors
- HTML Basic
- HTML Elements
- HTML Attributes
- HTML Headings
- HTML Paragraphs
- HTML Styles
- HTML Formatting
- HTML Quotations
- HTML Comments
- HTML Colors
- Colors
- RGB
- HEX
- HSL
- HTML CSS
- HTML Links
- Links
- Link Colors
- Link Bookmarks
- HTML Images
- Images
- Image Map
- Background Images
- The Picture Element
- HTML Favicon
- HTML Page Title
- HTML Tables
- HTML Tables
- Table Borders
- Table Sizes
- Table Headers
- Padding & Spacing
- Colspan & Rowspan
- Table Styling
- Table Colgroup
- HTML Lists
- Lists
- Unordered Lists
- Ordered Lists
- Other Lists
- HTML Block & Inline
- HTML Classes
- HTML Id
- HTML Iframes
- HTML JavaScript
- HTML File Paths
- HTML Head
- HTML Layout
- HTML Responsive
- HTML Computercode
- HTML Semantics
- HTML Style Guide
- HTML Entities
- HTML Symbols
- HTML Emojis
- HTML Charset
- HTML URL Encode
- HTML vs. XHTML
- HTML Forms
- HTML Form Attributes
- HTML Form Elements
- HTML Input Types
- HTML Input Attributes
- HTML Input Form Attributes
- HTML Canvas
- HTML SVG
- HTML Media
- HTML Video
- HTML Audio
- HTML Plug-ins
- HTML YouTube
- HTML Geolocation
- HTML Drag/Drop
- HTML Web Storage
- HTML Web Workers
- HTML SSE
- HTML Examples
- HTML Editor
- HTML Quiz
- HTML Exercises
- HTML Bootcamp
- HTML Certificate
- HTML Summary
- HTML Accessibility
- HTML Tag List
- HTML Attributes
- HTML Global Attributes
- HTML Browser Support
- HTML Events
- HTML Colors
- HTML Canvas
- HTML Audio/Video
- HTML Doctypes
- HTML Character Sets
- HTML URL Encode
- HTML Lang Codes
- HTTP Messages
- HTTP Methods
- PX to EM Converter
- Keyboard Shortcuts
Java
- Java HOME
- Java Intro
- Java Get Started
- Java Syntax
- Java Output
- Print Text
- Print Numbers
- Java Comments
- Java Variables
- Variables
- Print Variables
- Declare Multiple Variables
- Identifiers
- Java Data Types
- Data Types
- Numbers
- Booleans
- Characters
- Non-primitive Types
- Java Type Casting
- Java Operators
- Java Strings
- Strings
- Concatenation
- Numbers and Strings
- Special Characters
- Java Math
- Java Booleans
- Java If...Else
- If...Else
- Short Hand If...Else
- Java Switch
- Java While Loop
- Java For Loop
- For Loop
- For-Each Loop
- Java Break/Continue
- Java Arrays
- Arrays
- Loop Through an Array
- Multidimensional Arrays
- Java Methods
- Java Method Parameters
- Java Method Overloading
- Java Scope
- Java Recursion
- Java OOP
- Java Classes/Objects
- Java Class Attributes
- Java Class Methods
- Java Constructors
- Java Modifiers
- Java Encapsulation
- Java Packages / API
- Java Inheritance
- Java Polymorphism
- Java Inner Classes
- Java Abstraction
- Java Interface
- Java Enums
- Java User Input
- Java Date
- Java ArrayList
- Java LinkedList
- Java HashMap
- Java HashSet
- Java Iterator
- Java Wrapper Classes
- Java Exceptions
- Java RegEx
- Java Threads
- Java Lambda
- Java Files
- Java Create/Write Files
- Java Read Files
- Java Delete Files
- Add Two Numbers
- Count Words
- Reverse a String
- Sum of Array Elements
- Area of Rectangle
- Even or Odd Number
- Java Keywords
- abstract
- boolean
- break
- byte
- case
- catch
- char
- class
- continue
- default
- do
- double
- else
- enum
- extends
- final
- finally
- float
- for
- if
- implements
- import
- instanceof
- int
- interface
- long
- new
- package
- private
- protected
- public
- return
- short
- static
- super
- switch
- this
- throw
- throws
- try
- void
- while
- Java String Methods
- Java Math Methods
- Java Examples
- Java Compiler
- Java Exercises
- Java Quiz
- Java Certificate
- Java Operators
JavaScript
- JS HOME
- JS Introduction
- JS Where To
- JS Output
- JS Statements
- JS Syntax
- JS Comments
- JS Variables
- JS Let
- JS Const
- JS Operators
- JS Arithmetic
- JS Assignment
- JS Data Types
- JS Functions
- JS Objects
- JS Events
- JS Strings
- JS String Methods
- JS String Search
- JS String Templates
- JS Numbers
- JS BigInt
- JS Number Methods
- JS Number Properties
- JS Arrays
- JS Array Methods
- JS Array Sort
- JS Array Iteration
- JS Array Const
- JS Dates
- JS Date Formats
- JS Date Get Methods
- JS Date Set Methods
- JS Math
- JS Random
- JS Booleans
- JS Comparisons
- JS If Else
- JS Switch
- JS Loop For
- JS Loop For In
- JS Loop For Of
- JS Loop While
- JS Break
- JS Iterables
- JS Sets
- JS Maps
- JS Typeof
- JS Type Conversion
- JS Bitwise
- JS RegExp
- JS Precedence
- JS Errors
- JS Scope
- JS Hoisting
- JS Strict Mode
- JS this Keyword
- JS Arrow Function
- JS Classes
- JS Modules
- JS JSON
- JS Debugging
- JS Style Guide
- JS Best Practices
- JS Mistakes
- JS Performance
- JS Reserved Words
- JS Versions
- JS 2009 (ES5)
- JS 2015 (ES6)
- JS 2016
- JS 2017
- JS 2018
- JS 2019
- JS 2020
- JS 2021/2022
- JS IE / Edge
- JS History
- Object Definitions
- Object Properties
- Object Methods
- Object Display
- Object Accessors
- Object Constructors
- Object Prototypes
- Object Iterables
- Object Sets
- Object Maps
- Object Reference
- Function Definitions
- Function Parameters
- Function Invocation
- Function Call
- Function Apply
- Function Bind
- Function Closures
- Class Intro
- Class Inheritance
- Class Static
- JS Callbacks
- JS Asynchronous
- JS Promises
- JS Async/Await
- DOM Intro
- DOM Methods
- DOM Document
- DOM Elements
- DOM HTML
- DOM Forms
- DOM CSS
- DOM Animations
- DOM Events
- DOM Event Listener
- DOM Navigation
- DOM Nodes
- DOM Collections
- DOM Node Lists
- JS Window
- JS Screen
- JS Location
- JS History
- JS Navigator
- JS Popup Alert
- JS Timing
- JS Cookies
- Web API Intro
- Web Forms API
- Web History API
- Web Storage API
- Web Worker API
- Web Fetch API
- Web Geolocation API
- AJAX Intro
- AJAX XMLHttp
- AJAX Request
- AJAX Response
- AJAX XML File
- AJAX PHP
- AJAX ASP
- AJAX Database
- AJAX Applications
- AJAX Examples
- JSON Intro
- JSON Syntax
- JSON vs XML
- JSON Data Types
- JSON Parse
- JSON Stringify
- JSON Objects
- JSON Arrays
- JSON Server
- JSON PHP
- JSON HTML
- JSON JSONP
- jQuery Selectors
- jQuery HTML
- jQuery CSS
- jQuery DOM
- JS Graphics
- JS Canvas
- JS Plotly
- JS Chart.js
- JS Google Chart
- JS D3.js
- JS Examples
- JS HTML DOM
- JS HTML Input
- JS HTML Objects
- JS HTML Events
- JS Browser
- JS Editor
- JS Exercises
- JS Quiz
- JS Bootcamp
- JS Certificate
- JavaScript Objects
- HTML DOM Objects
jQuery
- jQuery HOME
- jQuery Intro
- jQuery Get Started
- jQuery Syntax
- jQuery Selectors
- jQuery Events
- jQuery Hide/Show
- jQuery Fade
- jQuery Slide
- jQuery Animate
- jQuery stop()
- jQuery Callback
- jQuery Chaining
- jQuery Get
- jQuery Set
- jQuery Add
- jQuery Remove
- jQuery CSS Classes
- jQuery css()
- jQuery Dimensions
- jQuery Traversing
- jQuery Ancestors
- jQuery Descendants
- jQuery Siblings
- jQuery Filtering
- jQuery AJAX Intro
- jQuery Load
- jQuery Get/Post
- jQuery noConflict()
- jQuery Filters
- jQuery Examples
- jQuery Editor
- jQuery Quiz
- jQuery Exercises
- jQuery Certificate
- jQuery Overview
- jQuery Selectors
- jQuery Events
- jQuery Effects
- jQuery HTML/CSS
- jQuery Traversing
- jQuery AJAX
- jQuery Misc
- jQuery Properties
Kotlin
- Kotlin HOME
- Kotlin Intro
- Kotlin Get Started
- Kotlin Syntax
- Kotlin Output
- Kotlin Comments
- Kotlin Variables
- Kotlin Data Types
- Kotlin Operators
- Kotlin Strings
- Kotlin Booleans
- Kotlin If...Else
- Kotlin When
- Kotlin While Loop
- Kotlin Break/Continue
- Kotlin Arrays
- Kotlin For Loop
- Kotlin Ranges
- Kotlin Functions
- Kotlin OOP
- Kotlin Classes/Objects
- Kotlin Constructors
- Kotlin Class Functions
- Kotlin Inheritance
- Kotlin Examples
- Kotlin Exercises
- Kotlin Quiz
- Kotlin Compiler
MongoDB
- MongoDB HOME
- MongoDB Get Started
- MongoDB Query API
- MongoDB Create Database
- MongoDB Create Collection
- MongoDB Insert
- MongoDB Find
- MongoDB Update
- MongoDB Delete
- MongoDB Query Operators
- MongoDB Update Operators
- MongoDB Aggregations
- MongoDB Aggregations
- $group
- $limit
- $project
- $sort
- $match
- $addFields
- $count
- $lookup
- $out
- MongoDB Indexing/Search
- MongoDB Validation
- MongoDB Data API
- MongoDB Drivers
- MongoDB Node.js Driver
- MongoDB Charts
- MongoDB Exercises
MySQL
- MySQL HOME
- MySQL Intro
- MySQL RDBMS
- MySQL SQL
- MySQL SELECT
- MySQL WHERE
- MySQL AND, OR, NOT
- MySQL ORDER BY
- MySQL INSERT INTO
- MySQL NULL Values
- MySQL UPDATE
- MySQL DELETE
- MySQL LIMIT
- MySQL MIN and MAX
- MySQL COUNT, AVG, SUM
- MySQL LIKE
- MySQL Wildcards
- MySQL IN
- MySQL BETWEEN
- MySQL Aliases
- MySQL Joins
- MySQL INNER JOIN
- MySQL LEFT JOIN
- MySQL RIGHT JOIN
- MySQL CROSS JOIN
- MySQL Self Join
- MySQL UNION
- MySQL GROUP BY
- MySQL HAVING
- MySQL EXISTS
- MySQL ANY, ALL
- MySQL INSERT SELECT
- MySQL CASE
- MySQL Null Functions
- MySQL Comments
- MySQL Operators
- MySQL Create DB
- MySQL Drop DB
- MySQL Create Table
- MySQL Drop Table
- MySQL Alter Table
- MySQL Constraints
- MySQL Not Null
- MySQL Unique
- MySQL Primary Key
- MySQL Foreign Key
- MySQL Check
- MySQL Default
- MySQL Create Index
- MySQL Auto Increment
- MySQL Dates
- MySQL Views
- MySQL Data Types
- MySQL Functions
- ASCII
- CHAR_LENGTH
- CHARACTER_LENGTH
- CONCAT
- CONCAT_WS
- FIELD
- FIND_IN_SET
- FORMAT
- INSERT
- INSTR
- LCASE
- LEFT
- LENGTH
- LOCATE
- LOWER
- LPAD
- LTRIM
- MID
- POSITION
- REPEAT
- REPLACE
- REVERSE
- RIGHT
- RPAD
- RTRIM
- SPACE
- STRCMP
- SUBSTR
- SUBSTRING
- SUBSTRING_INDEX
- TRIM
- UCASE
- UPPER
- ABS
- ACOS
- ASIN
- ATAN
- ATAN2
- AVG
- CEIL
- CEILING
- COS
- COT
- COUNT
- DEGREES
- DIV
- EXP
- FLOOR
- GREATEST
- LEAST
- LN
- LOG
- LOG10
- LOG2
- MAX
- MIN
- MOD
- PI
- POW
- POWER
- RADIANS
- RAND
- ROUND
- SIGN
- SIN
- SQRT
- SUM
- TAN
- TRUNCATE
- ADDDATE
- ADDTIME
- CURDATE
- CURRENT_DATE
- CURRENT_TIME
- CURRENT_TIMESTAMP
- CURTIME
- DATE
- DATEDIFF
- DATE_ADD
- DATE_FORMAT
- DATE_SUB
- DAY
- DAYNAME
- DAYOFMONTH
- DAYOFWEEK
- DAYOFYEAR
- EXTRACT
- FROM_DAYS
- HOUR
- LAST_DAY
- LOCALTIME
- LOCALTIMESTAMP
- MAKEDATE
- MAKETIME
- MICROSECOND
- MINUTE
- MONTH
- MONTHNAME
- NOW
- PERIOD_ADD
- PERIOD_DIFF
- QUARTER
- SECOND
- SEC_TO_TIME
- STR_TO_DATE
- SUBDATE
- SUBTIME
- SYSDATE
- TIME
- TIME_FORMAT
- TIME_TO_SEC
- TIMEDIFF
- TIMESTAMP
- TO_DAYS
- WEEK
- WEEKDAY
- WEEKOFYEAR
- YEAR
- YEARWEEK
- BIN
- BINARY
- CASE
- CAST
- COALESCE
- CONNECTION_ID
- CONV
- CONVERT
- CURRENT_USER
- DATABASE
- IF
- IFNULL
- ISNULL
- LAST_INSERT_ID
- NULLIF
- SESSION_USER
- SYSTEM_USER
- USER
- VERSION
- MySQL Examples
- MySQL Editor
- MySQL Quiz
- MySQL Exercises
- MySQL Certificate
Node.js
- Node.js HOME
- Node.js Intro
- Node.js Get Started
- Node.js Modules
- Node.js HTTP Module
- Node.js File System
- Node.js URL Module
- Node.js NPM
- Node.js Events
- Node.js Upload Files
- Node.js Email
- MySQL Get Started
- MySQL Create Database
- MySQL Create Table
- MySQL Insert Into
- MySQL Select From
- MySQL Where
- MySQL Order By
- MySQL Delete
- MySQL Drop Table
- MySQL Update
- MySQL Limit
- MySQL Join
- MongoDB Get Started
- MongoDB Create Database
- MongoDB Create Collection
- MongoDB Insert
- MongoDB Find
- MongoDB Query
- MongoDB Sort
- MongoDB Delete
- MongoDB Drop Collection
- MongoDB Update
- MongoDB Limit
- MongoDB Join
- RasPi Get Started
- RasPi GPIO Introduction
- RasPi Blinking LED
- RasPi LED & Pushbutton
- RasPi Flowing LEDs
- RasPi WebSocket
- RasPi RGB LED WebSocket
- RasPi Components
- Built-in Modules
- Node.js Compiler
PostgreSQL
- PostgreSQL Home
- PostgreSQL Intro
- PostgreSQL Install
- PostgreSQL Get Started
- PostgreSQL pgAdmin 4
- PostgreSQL CREATE TABLE
- PostgreSQL INSERT INTO
- PostgreSQL Fetch Data
- PostgreSQL ADD COLUMN
- PostgreSQL UPDATE
- PostgreSQL ALTER COLUMN
- PostgreSQL DROP COLUMN
- PostgreSQL DELETE
- PostgreSQL DROP TABLE
- Create Demo Database
- PostgreSQL Operators
- PostgreSQL SELECT
- PostgreSQL SELECT DISTINCT
- PostgreSQL WHERE
- PostgreSQL ORDER BY
- PostgreSQL LIMIT
- PostgreSQL MIN and MAX
- PostgreSQL COUNT
- PostgreSQL SUM
- PostgreSQL AVG
- PostgreSQL LIKE
- PostgreSQL IN
- PostgreSQL BETWEEN
- PostgreSQL AS
- PostgreSQL Joins
- PostgreSQL INNER JOIN
- PostgreSQL LEFT JOIN
- PostgreSQL RIGHT JOIN
- PostgreSQL FULL JOIN
- PostgreSQL CROSS JOIN
- PostgreSQL UNION
- PostgreSQL GROUP BY
- PostgreSQL HAVING
- PostgreSQL EXISTS
- PostgreSQL ANY
- PostgreSQL ALL
- PostgreSQL CASE
- PostgreSQL Exercises
- PostgreSQL Quiz
Python
- Python HOME
- Python Intro
- Python Get Started
- Python Syntax
- Python Comments
- Python Variables
- Python Variables
- Variable Names
- Assign Multiple Values
- Output Variables
- Global Variables
- Variable Exercises
- Python Data Types
- Python Numbers
- Python Casting
- Python Strings
- Python Strings
- Slicing Strings
- Modify Strings
- Concatenate Strings
- Format Strings
- Escape Characters
- String Methods
- String Exercises
- Python Booleans
- Python Operators
- Python Lists
- Python Lists
- Access List Items
- Change List Items
- Add List Items
- Remove List Items
- Loop Lists
- List Comprehension
- Sort Lists
- Copy Lists
- Join Lists
- List Methods
- List Exercises
- Python Tuples
- Python Tuples
- Access Tuples
- Update Tuples
- Unpack Tuples
- Loop Tuples
- Join Tuples
- Tuple Methods
- Tuple Exercises
- Python Sets
- Python Sets
- Access Set Items
- Add Set Items
- Remove Set Items
- Loop Sets
- Join Sets
- Set Methods
- Set Exercises
- Python Dictionaries
- Python Dictionaries
- Access Items
- Change Items
- Add Items
- Remove Items
- Loop Dictionaries
- Copy Dictionaries
- Nested Dictionaries
- Dictionary Methods
- Dictionary Exercise
- Python If...Else
- Python While Loops
- Python For Loops
- Python Functions
- Python Lambda
- Python Arrays
- Python Classes/Objects
- Python Inheritance
- Python Iterators
- Python Polymorphism
- Python Scope
- Python Modules
- Python Dates
- Python Math
- Python JSON
- Python RegEx
- Python PIP
- Python Try...Except
- Python User Input
- Python String Formatting
- Python File Handling
- Python Read Files
- Python Write/Create Files
- Python Delete Files
- NumPy Tutorial
- Pandas Tutorial
- SciPy Tutorial
- Django Tutorial
- Matplotlib Intro
- Matplotlib Get Started
- Matplotlib Pyplot
- Matplotlib Plotting
- Matplotlib Markers
- Matplotlib Line
- Matplotlib Labels
- Matplotlib Grid
- Matplotlib Subplot
- Matplotlib Scatter
- Matplotlib Bars
- Matplotlib Histograms
- Matplotlib Pie Charts
- Getting Started
- Mean Median Mode
- Standard Deviation
- Percentile
- Data Distribution
- Normal Data Distribution
- Scatter Plot
- Linear Regression
- Polynomial Regression
- Multiple Regression
- Scale
- Train/Test
- Decision Tree
- Confusion Matrix
- Hierarchical Clustering
- Logistic Regression
- Grid Search
- Categorical Data
- K-means
- Bootstrap Aggregation
- Cross Validation
- AUC - ROC Curve
- K-nearest neighbors
- MySQL Get Started
- MySQL Create Database
- MySQL Create Table
- MySQL Insert
- MySQL Select
- MySQL Where
- MySQL Order By
- MySQL Delete
- MySQL Drop Table
- MySQL Update
- MySQL Limit
- MySQL Join
- MongoDB Get Started
- MongoDB Create Database
- MongoDB Create Collection
- MongoDB Insert
- MongoDB Find
- MongoDB Query
- MongoDB Sort
- MongoDB Delete
- MongoDB Drop Collection
- MongoDB Update
- MongoDB Limit
- Python Overview
- Python Built-in Functions
- Python String Methods
- Python List Methods
- Python Dictionary Methods
- Python Tuple Methods
- Python Set Methods
- Python File Methods
- Python Keywords
- Python Exceptions
- Python Glossary
- Random Module
- Requests Module
- Statistics Module
- Math Module
- cMath Module
- Remove List Duplicates
- Reverse a String
- Add Two Numbers
- Python Examples
- Python Compiler
- Python Exercises
- Python Quiz
- Python Bootcamp
- Python Certificate
React
- React Home
- React Intro
- React Get Started
- React Upgrade
- React ES6
- React ES6
- ES6 Classes
- ES6 Arrow Functions
- ES6 Variables
- ES6 Array Methods
- ES6 Destructuring
- ES6 Spread Operator
- ES6 Modules
- ES6 Ternary Operator
- React Render HTML
- React JSX
- React Components
- React Class
- React Props
- React Events
- React Conditionals
- React Lists
- React Forms
- React Router
- React Memo
- React CSS Styling
- React Sass Styling
- What is a Hook?
- useState
- useEffect
- useContext
- useRef
- useReducer
- useCallback
- useMemo
- Custom Hooks
- React Compiler
- React Quiz
- React Exercises
- React Bootcamp
- React Certificate
Smart API
- Introduction
- How Smart API Works ?
- How to Use the API ?
- Customize APIs
- API Buttons Functionality
- Customize API using GUI
SmartApi Docs
SQL
- SQL HOME
- SQL Intro
- SQL Syntax
- SQL Select
- SQL Select Distinct
- SQL Where
- SQL Order By
- SQL And
- SQL Or
- SQL Not
- SQL Insert Into
- SQL Null Values
- SQL Update
- SQL Delete
- SQL Select Top
- SQL Min and Max
- SQL Count, Avg, Sum
- SQL Like
- SQL Wildcards
- SQL In
- SQL Between
- SQL Aliases
- SQL Joins
- SQL Inner Join
- SQL Left Join
- SQL Right Join
- SQL Full Join
- SQL Self Join
- SQL Union
- SQL Group By
- SQL Having
- SQL Exists
- SQL Any, All
- SQL Select Into
- SQL Insert Into Select
- SQL Case
- SQL Null Functions
- SQL Stored Procedures
- SQL Comments
- SQL Operators
- SQL Create DB
- SQL Drop DB
- SQL Backup DB
- SQL Create Table
- SQL Drop Table
- SQL Alter Table
- SQL Constraints
- SQL Not Null
- SQL Unique
- SQL Primary Key
- SQL Foreign Key
- SQL Check
- SQL Default
- SQL Index
- SQL Auto Increment
- SQL Dates
- SQL Views
- SQL Injection
- SQL Hosting
- SQL Data Types
- SQL Keywords
- ADD
- ADD CONSTRAINT
- ALL
- ALTER
- ALTER COLUMN
- ALTER TABLE
- AND
- ANY
- AS
- ASC
- BACKUP DATABASE
- BETWEEN
- CASE
- CHECK
- COLUMN
- CONSTRAINT
- CREATE
- CREATE DATABASE
- CREATE INDEX
- CREATE OR REPLACE VIEW
- CREATE TABLE
- CREATE PROCEDURE
- CREATE UNIQUE INDEX
- CREATE VIEW
- DATABASE
- DEFAULT
- DELETE
- DESC
- DISTINCT
- DROP
- DROP COLUMN
- DROP CONSTRAINT
- DROP DATABASE
- DROP DEFAULT
- DROP INDEX
- DROP TABLE
- DROP VIEW
- EXEC
- EXISTS
- FOREIGN KEY
- FROM
- FULL OUTER JOIN
- GROUP BY
- HAVING
- IN
- INDEX
- INNER JOIN
- INSERT INTO
- INSERT INTO SELECT
- IS NULL
- IS NOT NULL
- JOIN
- LEFT JOIN
- LIKE
- LIMIT
- NOT
- NOT NULL
- OR
- ORDER BY
- OUTER JOIN
- PRIMARY KEY
- PROCEDURE
- RIGHT JOIN
- ROWNUM
- SELECT
- SELECT DISTINCT
- SELECT INTO
- SELECT TOP
- SET
- TABLE
- TOP
- TRUNCATE TABLE
- UNION
- UNION ALL
- UNIQUE
- UPDATE
- VALUES
- VIEW
- WHERE
- MySQL Functions
- ASCII
- CHAR_LENGTH
- CHARACTER_LENGTH
- CONCAT
- CONCAT_WS
- FIELD
- FIND_IN_SET
- FORMAT
- INSERT
- INSTR
- LCASE
- LEFT
- LENGTH
- LOCATE
- LOWER
- LPAD
- LTRIM
- MID
- POSITION
- REPEAT
- REPLACE
- REVERSE
- RIGHT
- RPAD
- RTRIM
- SPACE
- STRCMP
- SUBSTR
- SUBSTRING
- SUBSTRING_INDEX
- TRIM
- UCASE
- UPPER
- ABS
- ACOS
- ASIN
- ATAN
- ATAN2
- AVG
- CEIL
- CEILING
- COS
- COT
- COUNT
- DEGREES
- DIV
- EXP
- FLOOR
- GREATEST
- LEAST
- LN
- LOG
- LOG10
- LOG2
- MAX
- MIN
- MOD
- PI
- POW
- POWER
- RADIANS
- RAND
- ROUND
- SIGN
- SIN
- SQRT
- SUM
- TAN
- TRUNCATE
- ADDDATE
- ADDTIME
- CURDATE
- CURRENT_DATE
- CURRENT_TIME
- CURRENT_TIMESTAMP
- CURTIME
- DATE
- DATEDIFF
- DATE_ADD
- DATE_FORMAT
- DATE_SUB
- DAY
- DAYNAME
- DAYOFMONTH
- DAYOFWEEK
- DAYOFYEAR
- EXTRACT
- FROM_DAYS
- HOUR
- LAST_DAY
- LOCALTIME
- LOCALTIMESTAMP
- MAKEDATE
- MAKETIME
- MICROSECOND
- MINUTE
- MONTH
- MONTHNAME
- NOW
- PERIOD_ADD
- PERIOD_DIFF
- QUARTER
- SECOND
- SEC_TO_TIME
- STR_TO_DATE
- SUBDATE
- SUBTIME
- SYSDATE
- TIME
- TIME_FORMAT
- TIME_TO_SEC
- TIMEDIFF
- TIMESTAMP
- TO_DAYS
- WEEK
- WEEKDAY
- WEEKOFYEAR
- YEAR
- YEARWEEK
- BIN
- BINARY
- CASE
- CAST
- COALESCE
- CONNECTION_ID
- CONV
- CONVERT
- CURRENT_USER
- DATABASE
- IF
- IFNULL
- ISNULL
- LAST_INSERT_ID
- NULLIF
- SESSION_USER
- SYSTEM_USER
- USER
- VERSION
- SQL Server Functions
- MS Access Functions
- SQL Quick Ref
- SQL Examples
- SQL Editor
- SQL Quiz
- SQL Exercises
- SQL Bootcamp
- SQL Certificate
SQL Commands
- Data Query Language (SELECT)
- Data Manipulation Language (INSERT,UPDATE,DELETE)
- Data Definition Language(CREATE,ALTER,DROP,TRUNCATE)
- Some Extra SQL Special Queries
TypeScript
- TS HOME
- TS Introduction
- TS Get Started
- TS Simple Types
- TS Special Types
- TS Arrays
- TS Tuples
- TS Object Types
- TS Enums
- TS Aliases & Interfaces
- TS Union Types
- TS Functions
- TS Casting
- TS Classes
- TS Basic Generics
- TS Utility Types
- TS Keyof
- TS Null
- TS Definitely Typed
- TS 5 Updates
- TS Editor
- TS Exercises
- TS Quiz
- TS Certificate
Vishal
- Test Vishal

Override Global Variable With Local Variable

From the previous page we have learned that global variables can be accessed/used through the entire document, while local variables can be used only inside the selector where it is declared.

Look at the example from the previous page:

Example

:root {
--blue: #1e90ff;
--white: #ffffff;
}

body {
background-color: var(--blue);
}

h2 {
border-bottom: 2px solid var(--blue);
}

.container {
color: var(--blue);
background-color: var(--white);
padding: 15px;
}

button {
background-color: var(--white);
color: var(--blue);
border: 1px solid var(--blue);
padding: 5px;
}

Sometimes we want the variables to change only in a specific section of the page.

Assume we want a different color of blue for button elements. Then, we can re-declare the --blue variable inside the button selector. When we use var(--blue) inside this selector, it will use the local --blue variable value declared here.

We see that the local --blue variable will override the global --blue variable for the button elements:

Example

:root {
--blue: #1e90ff;
--white: #ffffff;
}

body {
background-color: var(--blue);
}

h2 {
border-bottom: 2px solid var(--blue);
}

.container {
color: var(--blue);
background-color: var(--white);
padding: 15px;
}

button {
--blue: #0000ff; /* local variable will override global */
background-color: var(--white);
color: var(--blue);
border: 1px solid var(--blue);
padding: 5px;
}

Add a New Local Variable

If a variable is to be used at only one single place, we could also have declared a new local variable, like this:

Example

:root {
--blue: #1e90ff;
--white: #ffffff;
}

body {
background-color: var(--blue);
}

h2 {
border-bottom: 2px solid var(--blue);
}

.container {
color: var(--blue);
background-color: var(--white);
padding: 15px;
}

button {
--button-blue: #0000ff; /* new local variable */
background-color: var(--white);
color: var(--button-blue);
border: 1px solid var(--button-blue);
padding: 5px;
}

Browser Support

The numbers in the table specify the first browser version that fully supports the var() function.

Function
var()	49.0	15.0	31.0	9.1	36.0

CSS var() Function

Property	Description
	Inserts the value of a CSS variable

ADS CODE

Frequently Ask

What is VPS ? Explain in 100 word.