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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;
Try it Yourself »
let x = 10 + y;
Try it Yourself »

The += Operator

The Addition Assignment Operator adds a value to a variable.

Addition Assignment Examples

let x = 10;
x += 5;
Try it Yourself »
let text = "Hello"; text += " World";
Try it Yourself »

The -= Operator

The Subtraction Assignment Operator subtracts a value from a variable.

Subtraction Assignment Example

let x = 10;
x -= 5;
Try it Yourself »

The *= Operator

The Multiplication Assignment Operator multiplies a variable.

Multiplication Assignment Example

let x = 10;
x *= 5;
Try it Yourself »

The **= Operator

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

Exponentiation Assignment Example

let x = 10;
x **= 5;
Try it Yourself »

The /= Operator

The Division Assignment Operator divides a variable.

Division Assignment Example

let x = 10;
x /= 5;
Try it Yourself »

The %= Operator

The Remainder Assignment Operator assigns a remainder to a variable.

Remainder Assignment Example

let x = 10;
x %= 5;
Try it Yourself »


The <<= Operator

The Left Shift Assignment Operator left shifts a variable.

Left Shift Assignment Example

let x = -100;
x <<= 5;
Try it Yourself »

The >>= Operator

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

Right Shift Assignment Example

let x = -100;
x >>= 5;
Try it Yourself »

The >>>= Operator

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

Unsigned Right Shift Assignment Example

let x = -100;
x >>>= 5;
Try it Yourself »

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;
Try it Yourself »

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;
Try it Yourself »

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;
Try it Yourself »

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;
Try it Yourself »

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;
Try it Yourself »

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 = 10;
x ??= 5;
Try it Yourself »

The ??= operator is an ES2020 feature.


Test Yourself With Exercises

Exercise:

Use the correct assignment operator that will result in x being 15 (same as x = x + y).

x = 10;
y = 5;
x  y;

Start the Exercise