I'm trying to write a function that returns the finds first character in a String that doesn't repeat, so far I have this:
package main
import (
"fmt"
"strings"
)
func check(s string) string {
ss := strings.Split(s, "")
smap := map[string]int{}
for i := 0; i < len(ss); i++ {
(smap[ss[i]])++
}
for k, v := range smap {
if v == 1 {
return k
}
}
return ""
}
func main() {
fmt.Println(check("nebuchadnezzer"))
}
Unfortunately in Go when you iterate a map there's no guarantee of the order so every time I run the code I get a different value, any pointers?
Using a map and 2 loops : play
func check(s string) string {
m := make(map[rune]uint, len(s)) //preallocate the map size
for _, r := range s {
m[r]++
}
for _, r := range s {
if m[r] == 1 {
return string(r)
}
}
return ""
}
The benfit of this is using just 2 loops vs multiple loops if you're using strings.ContainsRune, strings.IndexRune (each function will have inner loops in them).
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