18 lines
391 B
Plaintext
18 lines
391 B
Plaintext
'use strict';
|
|
|
|
var $TypeError = require('es-errors/type');
|
|
|
|
var isNaN = require('../../helpers/isNaN');
|
|
|
|
// https://262.ecma-international.org/11.0/#sec-numeric-types-number-unaryMinus
|
|
|
|
module.exports = function NumberUnaryMinus(x) {
|
|
if (typeof x !== 'number') {
|
|
throw new $TypeError('Assertion failed: `x` argument must be a Number');
|
|
}
|
|
if (isNaN(x)) {
|
|
return NaN;
|
|
}
|
|
return -x;
|
|
};
|