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Tutorial
JavaScript Assignment Operators
An assignment operator assigns a value to its left operand based on the value of its right operand. The simple assignment operator is equal (=), which assigns the value of its right operand to its left operand. That is, x = y assigns the value of y to x.
There are also compound assignment operators that are shorthand for the operations listed in the following table:
| 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 |
| >>= | 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 |
Assignment Examples
The = assignment operator assigns a value to a variable.
EXAMPLE ❯
The += assignment operator adds a value to a variable.
The addition assignment operator ( += ) adds the value of the right operand to a variable and assigns the result to the variable.
The types of the two operands determine the behavior of the addition assignment operator.
EXAMPLE ❯
The -= assignment operator subtracts a value from a variable.
The subtraction assignment operator ( -= ) subtracts the value of the right operand from a variable and assigns the result to the variable.
EXAMPLE ❯
The *= assignment operator multiplies a variable.
The multiplication assignment operator ( *= ) multiplies a variable by the value of the right operand and assigns the result to the variable.
EXAMPLE ❯
The /= assignment divides a variable.
The division assignment operator ( /= ) divides a variable by the value of the right operand and assigns the result to the variable.
EXAMPLE ❯
The %= assignment operator assigns a remainder to a variable.
The remainder assignment operator ( %= ) divides a variable by the value of the right operand and assigns the remainder to the variable.