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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;