Function joinEval

expr/builtins/string.go:296–328

(ctx expr.EvalContext, vals []value.Value)

}

func joinEval(ctx expr.EvalContext, vals []value.Value) (value.Value, bool) {
	sep, ok := value.ValueToString(vals[len(vals)-1])
	if !ok {
		return value.EmptyStringValue, false
	}
	args := make([]string, 0)
	for i := 0; i < len(vals)-1; i++ {
		switch valTyped := vals[i].(type) {
		case value.SliceValue:
			svals := make([]string, len(valTyped.Val()))
			for i, sv := range valTyped.Val() {
				svals[i] = sv.ToString()
			}
			args = append(args, svals...)
		case value.StringsValue:
			svals := make([]string, len(valTyped.Val()))
			for i, sv := range valTyped.Val() {
				svals[i] = sv
			}
			args = append(args, svals...)
		case value.StringValue, value.NumberValue, value.IntValue:
			val := valTyped.ToString()
			if val == "" {
				continue
			}
			args = append(args, val)
		}
	}
	if len(args) == 0 {
		return value.EmptyStringValue, false
	}
	return value.NewStringValue(strings.Join(args, sep)), true
}

// HasPrefix string evaluation to see if string begins with
//