JavaScript Assignment Operators

Assignment operators assign values to JavaScript variables.

Operator	Example	Same As
=	x = y	x = y
+=	x += y	x = x + y
-=	x -= y	x = x - y
*=	x *= y	x = x * y
/=	x /= y	x = x / y
%=	x %= y	x = x % y
**=	x **= y	x = x ** y

Shift Assignment Operators

Operator	Example	Same As
<<=	x <<= y	x = x << y
>>=	x >>= y	x = x >> y
>>>=	x >>>= y	x = x >>> y

Bitwise Assignment Operators

Operator	Example	Same As
&=	x &= y	x = x & y
^=	x ^= y	x = x ^ y
|=	x |= y	x = x | y

Logical Assignment Operators

Operator	Example	Same As
&&=	x &&= y	x = x && (x = y)
||=	x ||= y	x = x || (x = y)
??=	x ??= y	x = x ?? (x = y)

Note

The Logical assignment operators are ES2020.

The = Operator

The Simple Assignment Operator assigns a value to a variable.

Simple Assignment Examples

let x = 10;

let x = 10 + y;

The += Operator

The Addition Assignment Operator adds a value to a variable.

Addition Assignment Examples

let x = 10;
x += 5;

let text = "Hello"; text += " World";

The -= Operator

The Subtraction Assignment Operator subtracts a value from a variable.

Subtraction Assignment Example

let x = 10;
x -= 5;

The *= Operator

The Multiplication Assignment Operator multiplies a variable.

Multiplication Assignment Example

let x = 10;
x *= 5;

The **= Operator

The Exponentiation Assignment Operator raises a variable to the power of the operand.

Exponentiation Assignment Example

let x = 10;
x **= 5;

The /= Operator

The Division Assignment Operator divides a variable.

Division Assignment Example

let x = 10;
x /= 5;

The %= Operator

The Remainder Assignment Operator assigns a remainder to a variable.

Remainder Assignment Example

let x = 10;
x %= 5;

The <<= Operator

The Left Shift Assignment Operator left shifts a variable.

Left Shift Assignment Example

let x = -100;
x <<= 5;

The >>= Operator

The Right Shift Assignment Operator right shifts a variable (signed).

Right Shift Assignment Example

let x = -100;
x >>= 5;

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