From 57dd49a3dd4e06230dccde12d383e5138d70194e Mon Sep 17 00:00:00 2001
From: kanersps <12296463+kanersps@users.noreply.github.com>
Date: Tue, 28 Sep 2021 14:00:00 +0200
Subject: [PATCH 1/2] feat: append function

---
 models/object/builtin.go | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/models/object/builtin.go b/models/object/builtin.go
index 3cebbb2..5bc1648 100644
--- a/models/object/builtin.go
+++ b/models/object/builtin.go
@@ -54,4 +54,29 @@ var Builtins = []struct {
 			},
 		},
 	},
+	{
+		"append",
+		&BuiltinFunction{
+			Function: func(args []Object) Object {
+				if len(args) <= 1 {
+					return &Error{Message: fmt.Sprintf("wrong number of arguments. expected=%d. got=%d", 2, len(args))}
+				}
+
+				if args[0].Type() != "ARRAY" {
+					return &Error{Message: fmt.Sprintf("wrong first argument. expected=%q. got=%q", "ARRAY", args[0].Type())}
+				}
+
+				array := args[0].(*Array)
+
+				newArray := &Array{Elements: array.Elements}
+
+				args = args[1:]
+
+				newArray.Elements = append(newArray.Elements, args...)
+
+				return newArray
+			},
+		},
+	},
+	{},
 }

From 65114f70e38780d39627e78a4cd125782560734a Mon Sep 17 00:00:00 2001
From: kanersps <12296463+kanersps@users.noreply.github.com>
Date: Tue, 28 Sep 2021 14:06:25 +0200
Subject: [PATCH 2/2] feat: slice function

---
 models/object/builtin.go | 28 +++++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/models/object/builtin.go b/models/object/builtin.go
index 5bc1648..f479b97 100644
--- a/models/object/builtin.go
+++ b/models/object/builtin.go
@@ -78,5 +78,31 @@ var Builtins = []struct {
 			},
 		},
 	},
-	{},
+	{
+		"slice",
+		&BuiltinFunction{
+			Function: func(args []Object) Object {
+				if len(args) <= 2 {
+					return &Error{Message: fmt.Sprintf("wrong number of arguments. expected=%d. got=%d", 3, len(args))}
+				}
+
+				array, ok := args[0].(*Array)
+				if !ok {
+					return &Error{Message: fmt.Sprintf("wrong argument. expected=\"ARRAY\". got=%q", args[0].Type())}
+				}
+
+				start, ok := args[1].(*Integer)
+				if !ok {
+					return &Error{Message: fmt.Sprintf("wrong argument. expected=\"INTEGER\". got=%q", args[0].Type())}
+				}
+
+				end, ok := args[2].(*Integer)
+				if !ok {
+					return &Error{Message: fmt.Sprintf("wrong argument. expected=\"INTEGER\". got=%q", args[0].Type())}
+				}
+
+				return &Array{Elements: array.Elements[start.Value:end.Value]}
+			},
+		},
+	},
 }