restructure project

internal/builtins/split.go

@@ -0,0 +1,32 @@
+package builtins
+
+import (
+	"monkey/internal/object"
+	"monkey/internal/typing"
+	"strings"
+)
+
+// Split ...
+func Split(args ...object.Object) object.Object {
+	if err := typing.Check(
+		"split", args,
+		typing.RangeOfArgs(1, 2),
+		typing.WithTypes(object.STRING_OBJ, object.STRING_OBJ),
+	); err != nil {
+		return newError(err.Error())
+	}
+
+	var sep string
+	s := args[0].(*object.String).Value
+
+	if len(args) == 2 {
+		sep = args[1].(*object.String).Value
+	}
+
+	tokens := strings.Split(s, sep)
+	elements := make([]object.Object, len(tokens))
+	for i, token := range tokens {
+		elements[i] = &object.String{Value: token}
+	}
+	return &object.Array{Elements: elements}
+}