JavaScript Assignment

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;

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let x = 10 + y;

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The += Operator

The Addition Assignment Operator adds a value to a variable.

Addition Assignment Examples

let x = 10;
x += 5;

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let text = "Hello"; text += " World";

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The -= Operator

The Subtraction Assignment Operator subtracts a value from a variable.

Subtraction Assignment Example

let x = 10;
x -= 5;

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The *= Operator

The Multiplication Assignment Operator multiplies a variable.

Multiplication Assignment Example

let x = 10;
x *= 5;

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The **= Operator

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

Exponentiation Assignment Example

let x = 10;
x **= 5;

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The /= Operator

The Division Assignment Operator divides a variable.

Division Assignment Example

let x = 10;
x /= 5;

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The %= Operator

The Remainder Assignment Operator assigns a remainder to a variable.

Remainder Assignment Example

let x = 10;
x %= 5;

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The <<= Operator

The Left Shift Assignment Operator left shifts a variable.

Left Shift Assignment Example

let x = -100;
x <<= 5;

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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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The >>>= Operator

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

Unsigned Right Shift Assignment Example

let x = -100;
x >>>= 5;

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The &= Operator

The Bitwise AND Assignment Operator does a bitwise AND operation on two operands and assigns the result to the the variable.

Bitwise AND Assignment Example

let x = 10;
x &= 5;

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The |= Operator

The Bitwise OR Assignment Operator does a bitwise OR operation on two operands and assigns the result to the variable.

Bitwise OR Assignment Example

let x = 10;
x |= 5;

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The ^= Operator

The Bitwise XOR Assignment Operator does a bitwise XOR operation on two operands and assigns the result to the variable.

Bitwise XOR Assignment Example

let x = 10;
x ^= 5;

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The &&= Operator

The Logical AND assignment operator is used between two values.

If the first value is true, the second value is assigned.

Logical AND Assignment Example

let x = 10;
x &&= 5;

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The &&= operator is an ES2020 feature.

The ||= Operator

The Logical OR assignment operator is used between two values.

If the first value is false, the second value is assigned.

Logical OR Assignment Example

let x = 10;
x ||= 5;

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The ||= operator is an ES2020 feature.

The ??= Operator

The Nullish coalescing assignment operator is used between two values.

If the first value is undefined or null, the second value is assigned.

Nullish Coalescing Assignment Example

let x;
x ??= 5;

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The ??= operator is an ES2020 feature.

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