arrays + builtins

object/object.go

@@ -18,6 +18,7 @@ const (
 	FUNCTION_OBJ     = "FUNCTION"
 	STRING_OBJ       = "STRING"
 	BUILTIN_OBJ      = "BUILTIN"
+	ARRAY_OBJ        = "ARRAY"
 )
 
 type Object interface {
@@ -133,3 +134,26 @@ func (b Builtin) Type() ObjectType {
 func (b Builtin) Inspect() string {
 	return "builtin function"
 }
+
+type Array struct {
+	Elements []Object
+}
+
+func (ao Array) Type() ObjectType {
+	return ARRAY_OBJ
+}
+
+func (ao Array) Inspect() string {
+	var out bytes.Buffer
+
+	elements := []string{}
+	for _, e := range ao.Elements {
+		elements = append(elements, e.Inspect())
+	}
+
+	out.WriteString("[")
+	out.WriteString(strings.Join(elements, ", "))
+	out.WriteString("]")
+
+	return out.String()
+}