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| /** | |
| * 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. A negative index will be treated as an offset from the end. | |
| * @param {number} [end=array.length] The end position. A negative index will be treated as an offset from the end. | |
| * @returns {Array} Returns the slice of `array`. | |
| * @example | |
| * | |
| * var array = [1, 2, 3, 4] | |
| * | |
| * _.slice(array, 2) | |
| * // => [3, 4] | |
| */ | |
| 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 |