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var baseSlice = require('./_baseSlice'),
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    isIterateeCall = require('./_isIterateeCall'),
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    toInteger = require('./toInteger');
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/* Built-in method references for those with the same name as other `lodash` methods. */
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var nativeCeil = Math.ceil,
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    nativeMax = Math.max;
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/**
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 * Creates an array of elements split into groups the length of `size`.
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 * If `array` can't be split evenly, the final chunk will be the remaining
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 * elements.
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 *
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 * @static
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 * @memberOf _
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 * @since 3.0.0
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 * @category Array
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 * @param {Array} array The array to process.
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 * @param {number} [size=1] The length of each chunk
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 * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
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 * @returns {Array} Returns the new array of chunks.
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 * @example
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 *
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 * _.chunk(['a', 'b', 'c', 'd'], 2);
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 * // => [['a', 'b'], ['c', 'd']]
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 *
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 * _.chunk(['a', 'b', 'c', 'd'], 3);
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 * // => [['a', 'b', 'c'], ['d']]
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 */
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function chunk(array, size, guard) {
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  if ((guard ? isIterateeCall(array, size, guard) : size === undefined)) {
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    size = 1;
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  } else {
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    size = nativeMax(toInteger(size), 0);
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  }
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  var length = array == null ? 0 : array.length;
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  if (!length || size < 1) {
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    return [];
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  }
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  var index = 0,
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      resIndex = 0,
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      result = Array(nativeCeil(length / size));
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  while (index < length) {
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    result[resIndex++] = baseSlice(array, index, (index += size));
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  }
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  return result;
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}
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module.exports = chunk;
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