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Filename : identical.js

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"use strict";

var isNaN = require("./is-nan");
var isNegZero = require("./is-neg-zero");

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

    return false;
}

module.exports = identical;