Subtraction assignment (-=)

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

Syntax

x -= y // x = x - y

Examples

Using subtraction assignment

// Assuming the following variable
//  bar = 5

bar -= 2     // 3
bar -= 'foo' // NaN

Specifications

Specification
ECMAScript Language Specification (ECMAScript)
# sec-assignment-operators

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See also