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Unary negation

The unary negation operator (-) precedes its operand and negates it.

Syntax

Operator: -x

Examples

Negating numbers

const x = 3;
const y = -x;

// y = -3
// x = 3

Negating non-numbers

The unary negation operator can convert a non-number into a number.

const x = "4";
const y = -x;

// y = -4

Specifications

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
Unary negation (-) 1 12 1 3 3 1
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
Unary negation (-) 1 18 4 10.1 1 1.0
Server
Node.js
Unary negation (-) 0.1.100

See also

© 2005–2018 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://wiki.developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Unary_negation