lodash/lodash

Apr 17, 2017
jdalton Remove `baseSlice`.
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42 lines (38 sloc) 1.01 KB
      
        /**
      
         * Creates a slice of `array` from `start` up to, but not including, `end`.
      
         *
      
         * **Note:** This method is used instead of
      
         * [`Array#slice`](https://mdn.io/Array/slice) to ensure dense arrays are
      
         * returned.
      
         *
      
         * @since 3.0.0
      
         * @category Array
      
         * @param {Array} array The array to slice.
      
         * @param {number} [start=0] The start position.
      
         * @param {number} [end=array.length] The end position.
      
         * @returns {Array} Returns the slice of `array`.
      
         */
      
        function slice(array, start, end) {
      
          let length = array == null ? 0 : array.length
      
          if (!length) {
      
            return []
      
          }
      
          start = start == null ? 0 : start
      
          end = end === undefined ? length : end
      
          if (start < 0) {
      
            start = -start > length ? 0 : (length + start)
      
          }
      
          end = end > length ? length : end
      
          if (end < 0) {
      
            end += length
      
          }
      
          length = start > end ? 0 : ((end - start) >>> 0)
      
          start >>>= 0
      
          let index = -1
      
          const result = new Array(length)
      
          while (++index < length) {
      
            result[index] = array[index + start]
      
          }
      
          return result
      
        }
      
        export default slice
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lodash/lodash

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