lodash/internal/baseIsEqual.js

define(['./baseIsEqualDeep'], function(baseIsEqualDeep) {

  /**
   * The base implementation of `_.isEqual` without support for `this` binding
   * `customizer` functions.
   *
   * @private
   * @param {*} value The value to compare.
   * @param {*} other The other value to compare.
   * @param {Function} [customizer] The function to customize comparing values.
   * @param {boolean} [isWhere] Specify performing partial comparisons.
   * @param {Array} [stackA] Tracks traversed `value` objects.
   * @param {Array} [stackB] Tracks traversed `other` objects.
   * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
   */
  function baseIsEqual(value, other, customizer, isWhere, stackA, stackB) {
    // Exit early for identical values.
    if (value === other) {
      // Treat `+0` vs. `-0` as not equal.
      return value !== 0 || (1 / value == 1 / other);
    }
    var valType = typeof value,
        othType = typeof other;

    // Exit early for unlike primitive values.
    if ((valType != 'function' && valType != 'object' && othType != 'function' && othType != 'object') ||
        value == null || other == null) {
      // Return `false` unless both values are `NaN`.
      return value !== value && other !== other;
    }
    return baseIsEqualDeep(value, other, baseIsEqual, customizer, isWhere, stackA, stackB);
  }

  return baseIsEqual;
});