71 lines
1.4 KiB
Go
71 lines
1.4 KiB
Go
package stringslice
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// StrContains => Contains
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// StringSliceEqual => Equal
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// StringSliceMergeSorted => MergeSorted
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// Contains checks if a list contains a string
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func Contains(l []string, s string) bool {
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for _, v := range l {
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if v == s {
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return true
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}
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}
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return false
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}
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// Equal compares two string slices for equality. Both the existence
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// of the elements and the order of those elements matter for equality. Empty
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// slices are treated identically to nil slices.
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func Equal(a, b []string) bool {
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if len(a) != len(b) {
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return false
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}
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for i := 0; i < len(a); i++ {
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if a[i] != b[i] {
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return false
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}
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}
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return true
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}
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// MergeSorted takes two string slices that are assumed to be sorted
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// and does a zipper merge of the two sorted slices, removing any cross-slice
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// duplicates. If any individual slice contained duplicates those will be
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// retained.
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func MergeSorted(a, b []string) []string {
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if len(a) == 0 && len(b) == 0 {
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return nil
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} else if len(a) == 0 {
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return b
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} else if len(b) == 0 {
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return a
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}
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out := make([]string, 0, len(a)+len(b))
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i, j := 0, 0
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for i < len(a) && j < len(b) {
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switch {
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case a[i] < b[j]:
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out = append(out, a[i])
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i++
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case a[i] > b[j]:
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out = append(out, b[j])
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j++
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default:
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out = append(out, a[i])
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i++
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j++
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}
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}
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if i < len(a) {
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out = append(out, a[i:]...)
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}
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if j < len(b) {
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out = append(out, b[j:]...)
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}
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return out
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}
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