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strings.go
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strings.go
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package xutil
//StringsMinus 差集s1-s2
func StringsMinus(s1, s2 []string) []string {
smap := make(map[string]int, 0)
s := make([]string, 0)
for _, v := range s2 {
smap[v] = 0
}
for _, v := range s1 {
if _, exists := smap[v]; !exists {
s = append(s, v)
}
}
return s
}
//StringsIntersect 交集 s1∩s2 去重
func StringsIntersect(s1, s2 []string) []string {
smap := make(map[string]int, 0)
s := make([]string, 0)
for _, v := range s2 {
smap[v] = 0
}
for _, v := range s1 {
if _, exists := smap[v]; exists {
s = append(s, v)
}
}
return s
}
//StringsUnion 并集 s1∪s2 去重
func StringsUnion(s1, s2 []string) []string {
smap := make(map[string]int, 0)
s := make([]string, 0)
for _, v := range s2 {
smap[v] = 0
}
for _, v := range s1 {
if _, exists := smap[v]; !exists {
smap[v] = 0
}
}
for k := range smap {
s = append(s, k)
}
return s
}
func SubString(str string, begin, length int) (substr string) {
rs := []rune(str)
lth := len(rs)
if begin < 0 {
begin = 0
}
if begin >= lth {
begin = lth
}
end := begin + length
if end > lth {
end = lth
}
return string(rs[begin:end])
}
//StringsUniq 去重
func StringsUniq(s1 []string) []string {
s := make([]string, 0)
smap := make(map[string]struct{}, 0)
for _, v := range s1 {
if _, exists := smap[v]; !exists {
s = append(s, v)
smap[v] = struct{}{}
}
}
return s
}
// StringsReverse reverses an array of string
func StringsReverse(s []string) []string {
for i, j := 0, len(s)-1; i < len(s)/2; i, j = i+1, j-1 {
s[i], s[j] = s[j], s[i]
}
return s
}
// StringReverse reverses a string
func StringReverse(s string) string {
r := []rune(s)
for i, j := 0, len(r)-1; i < len(r)/2; i, j = i+1, j-1 {
r[i], r[j] = r[j], r[i]
}
return string(r)
}