32 lines
800 B
Plaintext
32 lines
800 B
Plaintext
'use strict';
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var $TypeError = require('es-errors/type');
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var isFinite = require('math-intrinsics/isFinite');
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var isNaN = require('math-intrinsics/isNaN');
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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 (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 === 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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