Skip to content
月离文档

slice

string  slice(string s, int start, int end)

string  slice(string s, int start, int end, int step)

Extracts a string from a larger string.

<type>[] slice(<type>s[], int start, int end)

<type>[] slice(<type>s[], int start, int end, int step)

Extracts a sub-array from a larger array.

string  slice(string s, int hasstart, int start, int hasend, int end, int hasstep, int step)

<type>[] slice(<type>array[], int hasstart, int start, int hasend, int end, int hasstep, int step)

A general-purpose signature to support the slicing syntax. If hasstart is 0, it ignores start and uses 0. If hasend is 0 it ignores end and uses the length of the array. If hasstep is 0 it ignores step and uses 1.

  • This is the function equivalent of using value[start:end:step] slicing syntax.
  • If start or end are negative, they count from the end of the string/array.
  • The computed range is clamped to the bounds of the original string/array.
  • If step is zero, the function returns an empty string/array.
  • If step is negative, the items are returned in reverse, and end should be less than start.

Examples

examples

int[] nums = {10, 20, 30, 40, 50, 60};
slice(nums, 1, 3) == {20, 30};  // nums[1:3]
slice(nums, 1, -1) == {20, 30, 30, 40, 50};  // nums[1:-1]
slice(nums, 0, len(nums), 2) == {20, 40, 60};  // nums[0:len(nums):2]
slice(nums, 0, 0, 0, 0, 1, 2) == {20, 40, 60};  // nums[::2]