lodash/lodash

Apr 18, 2017

jdalton Remove `baseSlice`.

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38 lines (34 sloc) 920 Bytes

      
        import slice from './slice.js'
      
        /**
      
         * 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.
      
         *
      
         * @since 3.0.0
      
         * @category Array
      
         * @param {Array} array The array to process.
      
         * @param {number} [size=1] The length of each chunk
      
         * @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) {
      
          size = Math.max(size, 0)
      
          const length = array == null ? 0 : array.length
      
          if (!length || size < 1) {
      
            return []
      
          }
      
          let index = 0
      
          let resIndex = 0
      
          const result = new Array(Math.ceil(length / size))
      
          while (index < length) {
      
            result[resIndex++] = slice(array, index, (index += size))
      
          }
      
          return result
      
        }
      
        export default chunk

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