func-base.go: added functions to check data-type of a value

func-base.go

@@ -18,6 +18,42 @@ func isNilFunc(ctx ExprContext, name string, args []any) (result any, err error)
 	return
 }
 
+func isIntFunc(ctx ExprContext, name string, args []any) (result any, err error) {
+	result = IsInteger(args[0])
+	return
+}
+
+func isFloatFunc(ctx ExprContext, name string, args []any) (result any, err error) {
+	result = IsFloat(args[0])
+	return
+}
+
+func isBoolFunc(ctx ExprContext, name string, args []any) (result any, err error) {
+	result = IsBool(args[0])
+	return
+}
+
+func isStringFunc(ctx ExprContext, name string, args []any) (result any, err error) {
+	result = IsString(args[0])
+	return
+}
+
+func isFractionFunc(ctx ExprContext, name string, args []any) (result any, err error) {
+	result = IsFract(args[0])
+	return
+}
+
+func isListFunc(ctx ExprContext, name string, args []any) (result any, err error) {
+	result = IsList(args[0])
+	return
+}
+
+func isDictionaryFunc(ctx ExprContext, name string, args []any) (result any, err error) {
+	result = IsDict(args[0])
+	return
+}
+
+
 func intFunc(ctx ExprContext, name string, args []any) (result any, err error) {
 	if len(args) == 1 {
 		switch v := args[0].(type) {
@@ -50,8 +86,17 @@ func iteratorFunc(ctx ExprContext, name string, args []any) (result any, err err
 }
 
 func ImportBuiltinsFuncs(ctx ExprContext) {
-	ctx.RegisterFunc("isNil", &simpleFunctor{f: isNilFunc}, 1, -1)
+	ctx.RegisterFunc("isNil", &simpleFunctor{f: isNilFunc}, 1, 1)
-	ctx.RegisterFunc("int", &simpleFunctor{f: intFunc}, 1, -1)
+	ctx.RegisterFunc("isInt", &simpleFunctor{f: isIntFunc}, 1, 1)
+	ctx.RegisterFunc("isFloat", &simpleFunctor{f: isFloatFunc}, 1, 1)
+	ctx.RegisterFunc("isBool", &simpleFunctor{f: isBoolFunc}, 1, 1)
+	ctx.RegisterFunc("isString", &simpleFunctor{f: isStringFunc}, 1, 1)
+	ctx.RegisterFunc("isFraction", &simpleFunctor{f: isFractionFunc}, 1, 1)
+	ctx.RegisterFunc("isFract", &simpleFunctor{f: isFractionFunc}, 1, 1)
+	ctx.RegisterFunc("isList", &simpleFunctor{f: isListFunc}, 1, 1)
+	ctx.RegisterFunc("isDictionary", &simpleFunctor{f: isDictionaryFunc}, 1, 1)
+	ctx.RegisterFunc("isDict", &simpleFunctor{f: isDictionaryFunc}, 1, 1)
+	ctx.RegisterFunc("int", &simpleFunctor{f: intFunc}, 1, 1)
 }
 
 func init() {