The unary negation operator (-
) precedes its operand and negates it.
The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
The source for this interactive example is stored in a GitHub
repository. If you'd like to contribute to the interactive examples project, please
clone https://github.com/mdn/interactive-examples
and send us a pull request.
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
Specification |
---|
ECMAScript (ECMA-262) The definition of 'Unary negation operator' in that specification. |
Browser compatibility
BCD tables only load in the browser