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