32 lines
1000 B
JavaScript
32 lines
1000 B
JavaScript
"use strict";
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var isNaN = require("./is-nan");
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var isNegZero = require("./is-neg-zero");
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/**
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* Strict equality check according to EcmaScript Harmony's `egal`.
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*
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* **From the Harmony wiki:**
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* > An `egal` function simply makes available the internal `SameValue` function
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* > from section 9.12 of the ES5 spec. If two values are egal, then they are not
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* > observably distinguishable.
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*
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* `identical` returns `true` when `===` is `true`, except for `-0` and
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* `+0`, where it returns `false`. Additionally, it returns `true` when
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* `NaN` is compared to itself.
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*
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* @alias module:samsam.identical
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* @param {*} obj1 The first value to compare
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* @param {*} obj2 The second value to compare
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* @returns {boolean} Returns `true` when the objects are *egal*, `false` otherwise
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*/
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function identical(obj1, obj2) {
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if (obj1 === obj2 || (isNaN(obj1) && isNaN(obj2))) {
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return obj1 !== 0 || isNegZero(obj1) === isNegZero(obj2);
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}
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return false;
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}
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module.exports = identical;
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