Subtraction assignment (-=)

The subtraction assignment (-=) operator subtracts the value of the right operand from a variable and assigns the result to the variable.

Try it

Syntax

x -= y // x = x - y

Examples

Using subtraction assignment

let bar = 5;

bar -= 2; // 3
bar -= "foo"; // NaN

Specifications

Specification
ECMAScript Language Specification
# sec-assignment-operators

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See also