/**
 * Lo-Dash 2.4.1 (Custom Build) <http://lodash.com/>
 * Build: `lodash modularize modern exports="node" -o ./modern/`
 * Copyright 2012-2013 The Dojo Foundation <http://dojofoundation.org/>
 * Based on Underscore.js 1.5.2 <http://underscorejs.org/LICENSE>
 * Copyright 2009-2013 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
 * Available under MIT license <http://lodash.com/license>
 */
var baseCreateCallback = require('../internals/baseCreateCallback'),
    baseIsEqual = require('../internals/baseIsEqual');

/**
 * Performs a deep comparison between two values to determine if they are
 * equivalent to each other. If a callback is provided it will be executed
 * to compare values. If the callback returns `undefined` comparisons will
 * be handled by the method instead. The callback is bound to `thisArg` and
 * invoked with two arguments; (a, b).
 *
 * @static
 * @memberOf _
 * @category Objects
 * @param {*} a The value to compare.
 * @param {*} b The other value to compare.
 * @param {Function} [callback] The function to customize comparing values.
 * @param {*} [thisArg] The `this` binding of `callback`.
 * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
 * @example
 *
 * var object = { 'name': 'fred' };
 * var copy = { 'name': 'fred' };
 *
 * object == copy;
 * // => false
 *
 * _.isEqual(object, copy);
 * // => true
 *
 * var words = ['hello', 'goodbye'];
 * var otherWords = ['hi', 'goodbye'];
 *
 * _.isEqual(words, otherWords, function(a, b) {
 *   var reGreet = /^(?:hello|hi)$/i,
 *       aGreet = _.isString(a) && reGreet.test(a),
 *       bGreet = _.isString(b) && reGreet.test(b);
 *
 *   return (aGreet || bGreet) ? (aGreet == bGreet) : undefined;
 * });
 * // => true
 */
function isEqual(a, b, callback, thisArg) {
  return baseIsEqual(a, b, typeof callback == 'function' && baseCreateCallback(callback, thisArg, 2));
}

module.exports = isEqual;