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.
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.
The *= Operator
The Multiplication Assignment Operator multiplies a variable.
The **= Operator
The Exponentiation Assignment Operator raises a variable to the power of the operand.
The /= Operator
The Division Assignment Operator divides a variable.
The %= Operator
The Remainder Assignment Operator assigns a remainder to a variable.
The <<= Operator
The Left Shift Assignment Operator left shifts a variable.
The >>= Operator
The Right Shift Assignment Operator right shifts a variable (signed).
The >>>= Operator
The Unsigned Right Shift Assignment Operator right shifts a variable (unsigned).
The &= Operator
The Bitwise AND Assignment Operator does a bitwise AND operation on two operands and assigns the result to the the variable.
The |= Operator
The Bitwise OR Assignment Operator does a bitwise OR operation on two operands and assigns the result to the variable.
The ^= Operator
The Bitwise XOR Assignment Operator does a bitwise XOR operation on two operands and assigns the result to the variable.
The &&= Operator
The Logical AND assignment operator is used between two values.
If the first value is true, the second value is assigned.
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.
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.
The ??= operator is an ES2020 feature.
