HORIZON PROJECT

var baseSlice = require('./_baseSlice'),

    isIterateeCall = require('./_isIterateeCall'),

    toInteger = require('./toInteger');

/* Built-in method references for those with the same name as other `lodash` methods. */

var nativeCeil = Math.ceil,

    nativeMax = Math.max;

/**

 * Creates an array of elements split into groups the length of `size`.

 * If `array` can't be split evenly, the final chunk will be the remaining

 * elements.

 *

 * @static

 * @memberOf _

 * @since 3.0.0

 * @category Array

 * @param {Array} array The array to process.

 * @param {number} [size=1] The length of each chunk

 * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.

 * @returns {Array} Returns the new array of chunks.

 * @example

 *

 * _.chunk(['a', 'b', 'c', 'd'], 2);

 * // => [['a', 'b'], ['c', 'd']]

 *

 * _.chunk(['a', 'b', 'c', 'd'], 3);

 * // => [['a', 'b', 'c'], ['d']]

 */

function chunk(array, size, guard) {

  if ((guard ? isIterateeCall(array, size, guard) : size === undefined)) {

    size = 1;

  } else {

    size = nativeMax(toInteger(size), 0);

  }

  var length = array == null ? 0 : array.length;

  if (!length || size < 1) {

    return [];

  }

  var index = 0,

      resIndex = 0,

      result = Array(nativeCeil(length / size));

  while (index < length) {

    result[resIndex++] = baseSlice(array, index, (index += size));

  }

  return result;

}

module.exports = chunk;