The subtraction assignment operator (-=
) subtracts the value of the right operand from a variable and assigns the result to the variable.
Subtraction assignment (-=)
Try it
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 | Server | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | Deno | Node.js | |
Subtraction_assignment |
1
|
12
|
1
|
3
|
3
|
1
|
1
|
18
|
4
|
10.1
|
1
|
1.0
|
1.0
|
0.10.0
|
See also
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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Subtraction_assignment