| 'use strict'; |
| |
| var GetIntrinsic = require('get-intrinsic'); |
| |
| var $TypeError = GetIntrinsic('%TypeError%'); |
| |
| var isNaN = require('../../helpers/isNaN'); |
| |
| var Type = require('../Type'); |
| |
| // https://262.ecma-international.org/11.0/#sec-numeric-types-number-multiply |
| |
| module.exports = function NumberMultiply(x, y) { |
| if (Type(x) !== 'Number' || Type(y) !== 'Number') { |
| throw new $TypeError('Assertion failed: `x` and `y` arguments must be Numbers'); |
| } |
| |
| if (isNaN(x) || isNaN(y) || (x === 0 && !isFinite(y)) || (!isFinite(x) && y === 0)) { |
| return NaN; |
| } |
| if (!isFinite(x) && !isFinite(y)) { |
| return x === y ? Infinity : -Infinity; |
| } |
| if (!isFinite(x) && y !== 0) { |
| return x > 0 ? Infinity : -Infinity; |
| } |
| if (!isFinite(y) && x !== 0) { |
| return y > 0 ? Infinity : -Infinity; |
| } |
| |
| // shortcut for the actual spec mechanics |
| return x * y; |
| }; |