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;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;The >>>= Operator
The Unsigned Right Shift Assignment Operator right shifts a variable (unsigned).
Unsigned Right Shift Assignment Example
let x = -100;
x >>>= 5;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;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;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;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;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;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;The ??= operator is an ES2020 feature.