Function CheckString

auxiliary.go:317–323

CheckString checks whether the function argument at index is a string and returns this string. This function uses ToString to get its result, so all conversions and caveats of that function apply here.

(l *State, index int)

//
// This function uses ToString to get its result, so all conversions and caveats of that function apply here.
func CheckString(l *State, index int) string {
	if s, ok := l.ToString(index); ok {
		return s
	}
	tagError(l, index, TypeString)
	panic("unreachable")
}

// OptString returns the string at index if it is a string. If this argument is
// absent or is nil, returns def. Otherwise, raises an error.