[string] What is the best way to test for an empty string in Go?

This would be more performant than trimming the whole string, since you only need to check for at least a single non-space character existing

// Strempty checks whether string contains only whitespace or not
func Strempty(s string) bool {
    if len(s) == 0 {
        return true
    }

    r := []rune(s)
    l := len(r)

    for l > 0 {
        l--
        if !unicode.IsSpace(r[l]) {
            return false
        }
    }

    return true
}

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