/**
 * lodash 3.0.0 (Custom Build) <https://lodash.com/>
 * Build: `lodash modern modularize exports="npm" -o ./`
 * Copyright 2012-2015 The Dojo Foundation <http://dojofoundation.org/>
 * Based on Underscore.js 1.7.0 <http://underscorejs.org/LICENSE>
 * Copyright 2009-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
 * Available under MIT license <https://lodash.com/license>
 */
var baseIsEqual = require('lodash._baseisequal'),
    bindCallback = require('lodash._bindcallback');

/**
 * Checks if `value` is suitable for strict equality comparisons, i.e. `===`.
 *
 * @private
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` if suitable for strict
 *  equality comparisons, else `false`.
 */
function isStrictComparable(value) {
  return value === value && (value === 0 ? ((1 / value) > 0) : !isObject(value));
}

/**
 * Performs a deep comparison between two values to determine if they are
 * equivalent. If `customizer` is provided it is invoked to compare values.
 * If `customizer` returns `undefined` comparisons are handled by the method
 * instead. The `customizer` is bound to `thisArg` and invoked with three
 * arguments; (value, other [, index|key]).
 *
 * **Note:** This method supports comparing arrays, booleans, `Date` objects,
 * numbers, `Object` objects, regexes, and strings. Objects are compared by
 * their own, not inherited, enumerable properties. Functions and DOM nodes
 * are **not** supported. Provide a customizer function to extend support
 * for comparing other values.
 *
 * @static
 * @memberOf _
 * @category Lang
 * @param {*} value The value to compare.
 * @param {*} other The other value to compare.
 * @param {Function} [customizer] The function to customize comparing values.
 * @param {*} [thisArg] The `this` binding of `customizer`.
 * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
 * @example
 *
 * var object = { 'user': 'fred' };
 * var other = { 'user': 'fred' };
 *
 * object == other;
 * // => false
 *
 * _.isEqual(object, other);
 * // => true
 *
 * // using a customizer callback
 * var array = ['hello', 'goodbye'];
 * var other = ['hi', 'goodbye'];
 *
 * _.isEqual(array, other, function(value, other) {
 *   if (_.every([value, other], RegExp.prototype.test, /^h(?:i|ello)$/)) {
 *     return true;
 *   }
 * });
 * // => true
 */
function isEqual(value, other, customizer, thisArg) {
  customizer = typeof customizer == 'function' && bindCallback(customizer, thisArg, 3);
  if (!customizer && isStrictComparable(value) && isStrictComparable(other)) {
    return value === other;
  }
  var result = customizer ? customizer(value, other) : undefined;
  return typeof result == 'undefined' ? baseIsEqual(value, other, customizer) : !!result;
}

/**
 * Checks if `value` is the language type of `Object`.
 * (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
 *
 * **Note:** See the [ES5 spec](https://es5.github.io/#x8) for more details.
 *
 * @static
 * @memberOf _
 * @category Lang
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is an object, else `false`.
 * @example
 *
 * _.isObject({});
 * // => true
 *
 * _.isObject([1, 2, 3]);
 * // => true
 *
 * _.isObject(1);
 * // => false
 */
function isObject(value) {
  // Avoid a V8 JIT bug in Chrome 19-20.
  // See https://code.google.com/p/v8/issues/detail?id=2291 for more details.
  var type = typeof value;
  return type == 'function' || (value && type == 'object') || false;
}

module.exports = isEqual;