The addition operator (+) produces the sum of numeric operands or string concatenation.
Addition (+)
Try it
Syntax
x + y
Examples
Numeric addition
// Number + Number -> addition 1 + 2 // 3 // Boolean + Number -> addition true + 1 // 2 // Boolean + Boolean -> addition false + false // 0
String concatenation
// String + String -> concatenation 'foo' + 'bar' // "foobar" // Number + String -> concatenation 5 + 'foo' // "5foo" // String + Boolean -> concatenation 'foo' + false // "foofalse"
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 | |
Addition |
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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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Addition
