| '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-add |
| |
| module.exports = function NumberAdd(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 === Infinity && y === -Infinity) || (x === -Infinity && y === Infinity)) { |
| return NaN; |
| } |
| |
| if ((x === Infinity && y === Infinity) || (x === -Infinity && y === -Infinity)) { |
| return x; |
| } |
| |
| if (x === Infinity) { |
| return x; |
| } |
| |
| if (y === Infinity) { |
| return y; |
| } |
| |
| if (x === y && x === 0) { |
| return Infinity / x === -Infinity && Infinity / y === -Infinity ? -0 : +0; |
| } |
| |
| if (x === -y || -x === y) { |
| return +0; |
| } |
| |
| // shortcut for the actual spec mechanics |
| return x + y; |
| }; |