37 lines
875 B
JavaScript
37 lines
875 B
JavaScript
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'use strict';
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var GetIntrinsic = require('get-intrinsic');
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var $TypeError = GetIntrinsic('%TypeError%');
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var isFinite = require('../../helpers/isFinite');
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var isNaN = require('../../helpers/isNaN');
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var Type = require('../Type');
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// https://262.ecma-international.org/12.0/#sec-numeric-types-number-add
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module.exports = function NumberAdd(x, y) {
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if (Type(x) !== 'Number' || Type(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 === Infinity && y === -Infinity) || (x === -Infinity && y === Infinity)) {
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return NaN;
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}
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if (!isFinite(x)) {
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return x;
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}
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if (!isFinite(y)) {
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return y;
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}
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if (x === y && x === 0) { // both zeroes
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return Infinity / x === -Infinity && Infinity / y === -Infinity ? -0 : +0;
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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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