array/unzip.js

define(['../internal/arrayMap', '../internal/arrayMax', '../internal/baseProperty'], function(arrayMap, arrayMax, baseProperty) {

  /** Used to the length of n-tuples for `_.unzip`. */
  var getLength = baseProperty('length');

  /**
   * This method is like `_.zip` except that it accepts an array of grouped
   * elements and creates an array regrouping the elements to their pre-`_.zip`
   * configuration.
   *
   * @static
   * @memberOf _
   * @category Array
   * @param {Array} array The array of grouped elements to process.
   * @returns {Array} Returns the new array of regrouped elements.
   * @example
   *
   * var zipped = _.zip(['fred', 'barney'], [30, 40], [true, false]);
   * // => [['fred', 30, true], ['barney', 40, false]]
   *
   * _.unzip(zipped);
   * // => [['fred', 'barney'], [30, 40], [true, false]]
   */
  function unzip(array) {
    var index = -1,
        length = (array && array.length && arrayMax(arrayMap(array, getLength))) >>> 0,
        result = Array(length);

    while (++index < length) {
      result[index] = arrayMap(array, baseProperty(index));
    }
    return result;
  }

  return unzip;
});