Use utf8.DecodeRuneInString instead of []rune(string)[0] GO-P4006
Performance
Major
It is recommended to use utf8.DecodeRuneInString instead of
[]rune(string)[0] to prevent unwanted rune slice allocation.
Bad practice
package main
func getFirstRune(s string) rune {
r := []rune(s)[0]
return r
}
Recommended
package main
import (
"unicode/utf8"
)
func getFirstRune(s string) rune {
r, _ := utf8.DecodeRuneInString(s)
return r
}