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87 lines
1.4 KiB
87 lines
1.4 KiB
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package main
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import (
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student "student"
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"lib"
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)
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func ifNegative(a []string, n int) int {
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if n < 0 {
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n = len(a) + n
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}
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if n < 0 {
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n = 0
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} else if n > len(a) {
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n = len(a)
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}
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return n
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}
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func slice(a []string, nbr ...int) []string {
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if len(nbr) == 0 {
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return a
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}
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first := nbr[0]
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if len(nbr) == 1 {
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if first < 0 {
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first = len(a) + first
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if first < 0 {
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return a
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}
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}
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return a[first:]
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}
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second := nbr[1]
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first = ifNegative(a, first)
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second = ifNegative(a, second)
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if first > second {
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return nil
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}
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return a[first:second]
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}
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func main() {
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elems := [][]interface{}{
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{
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[]string{"coding", "algorithm", "ascii", "package", "golang"},
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1,
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},
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{
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[]string{"coding", "algorithm", "ascii", "package", "golang"},
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-3,
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},
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{
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[]string{"coding", "algorithm", "ascii", "package", "golang"},
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2, 4,
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},
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{
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[]string{"coding", "algorithm", "ascii", "package", "golang"},
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-2, -1,
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},
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{
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[]string{"coding", "algorithm", "ascii", "package", "golang"},
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2, 0,
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},
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}
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s := lib.MultRandWords()
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elems = append(elems, []interface{}{s, -len(s) - 10, -len(s) - 5})
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for i := 0; i < 3; i++ {
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s = lib.MultRandWords()
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elems = append(elems, []interface{}{s, lib.RandIntBetween(-len(s)-10, len(s)+10), lib.RandIntBetween(-len(s)-8, len(s)+10)})
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}
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for _, a := range elems {
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lib.Challenge("Slice", student.Slice, slice, a...)
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}
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}
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