/**
 * Lo-Dash 2.4.1 (Custom Build) <http://lodash.com/>
 * Build: `lodash modularize underscore exports="node" -o ./underscore/`
 * 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 baseUniq = require('../internals/baseUniq'),
    createCallback = require('../functions/createCallback');

/**
 * Creates a duplicate-value-free version of an array using strict equality
 * for comparisons, i.e. `===`. If the array is sorted, providing
 * `true` for `isSorted` will use a faster algorithm. If a callback is provided
 * each element of `array` is passed through the callback before uniqueness
 * is computed. The callback is bound to `thisArg` and invoked with three
 * arguments; (value, index, array).
 *
 * If a property name is provided for `callback` the created "_.pluck" style
 * callback will return the property value of the given element.
 *
 * If an object is provided for `callback` the created "_.where" style callback
 * will return `true` for elements that have the properties of the given object,
 * else `false`.
 *
 * @static
 * @memberOf _
 * @alias unique
 * @category Arrays
 * @param {Array} array The array to process.
 * @param {boolean} [isSorted=false] A flag to indicate that `array` is sorted.
 * @param {Function|Object|string} [callback=identity] The function called
 *  per iteration. If a property name or object is provided it will be used
 *  to create a "_.pluck" or "_.where" style callback, respectively.
 * @param {*} [thisArg] The `this` binding of `callback`.
 * @returns {Array} Returns a duplicate-value-free array.
 * @example
 *
 * _.uniq([1, 2, 1, 3, 1]);
 * // => [1, 2, 3]
 *
 * _.uniq([1, 1, 2, 2, 3], true);
 * // => [1, 2, 3]
 *
 * _.uniq(['A', 'b', 'C', 'a', 'B', 'c'], function(letter) { return letter.toLowerCase(); });
 * // => ['A', 'b', 'C']
 *
 * _.uniq([1, 2.5, 3, 1.5, 2, 3.5], function(num) { return this.floor(num); }, Math);
 * // => [1, 2.5, 3]
 *
 * // using "_.pluck" callback shorthand
 * _.uniq([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');
 * // => [{ 'x': 1 }, { 'x': 2 }]
 */
function uniq(array, isSorted, callback, thisArg) {
  // juggle arguments
  if (typeof isSorted != 'boolean' && isSorted != null) {
    thisArg = callback;
    callback = (typeof isSorted != 'function' && thisArg && thisArg[isSorted] === array) ? null : isSorted;
    isSorted = false;
  }
  if (callback != null) {
    callback = createCallback(callback, thisArg, 3);
  }
  return baseUniq(array, isSorted, callback);
}

module.exports = uniq;
