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
Browser compatibility
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
Subtraction_assignment |
1 |
12 |
1 |
3 |
3 |
1 |
1 |
18 |
4 |
10.1 |
1 |
1.0 |
See also
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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Subtraction_assignment