diff --git a/evaluator/builtins.go b/evaluator/builtins.go
deleted file mode 100644
index 79a588a..0000000
--- a/evaluator/builtins.go
+++ /dev/null
@@ -1,97 +0,0 @@
-package evaluator
-
-import (
-	"fmt"
-	"github.com/flipez/rocket-lang/object"
-	"os"
-)
-
-var builtins = map[string]*object.Builtin{
-	"len": &object.Builtin{
-		Fn: func(args ...object.Object) object.Object {
-			if len(args) != 1 {
-				return newError("wrong number of arguments. got=%d, want=1", len(args))
-			}
-
-			switch arg := args[0].(type) {
-			case *object.Array:
-				return &object.Integer{Value: int64(len(arg.Elements))}
-			case *object.String:
-				return &object.Integer{Value: int64(len(arg.Value))}
-			default:
-				return newError("argument to `len` not supported, got %s", args[0].Type())
-			}
-		},
-	},
-	"puts": &object.Builtin{
-		Fn: func(args ...object.Object) object.Object {
-			for _, arg := range args {
-				fmt.Println(arg.Inspect())
-			}
-
-			return nil
-		},
-	},
-	"exit": &object.Builtin{
-		Fn: func(args ...object.Object) object.Object {
-			if len(args) != 1 {
-				return newError("wrong number of arguments. got=%d, want=1", len(args))
-			}
-			if args[0].Type() != object.INTEGER_OBJ {
-				return newError("argument to `exit` must be INTEGER, got=%s", args[0].Type())
-			}
-
-			os.Exit(int(args[0].(*object.Integer).Value))
-
-			return nil
-		},
-	},
-	"raise": &object.Builtin{
-		Fn: func(args ...object.Object) object.Object {
-			if len(args) != 2 {
-				return newError("wrong number of arguments. got=%d, want=2", len(args))
-			}
-			if args[0].Type() != object.INTEGER_OBJ {
-				return newError("first argument to `raise` must be INTEGER, got=%s", args[0].Type())
-			}
-			if args[1].Type() != object.STRING_OBJ {
-				return newError("second argument to `raise` must be STRING, got=%s", args[1].Type())
-			}
-
-			fmt.Printf("🔥 RocketLang raised an error: %s\n", args[1].Inspect())
-			os.Exit(int(args[0].(*object.Integer).Value))
-
-			return nil
-		},
-	},
-	"open": &object.Builtin{
-		Fn: func(args ...object.Object) object.Object {
-			path := ""
-			mode := "r"
-
-			if len(args) < 1 {
-				return newError("wrong number of arguments. got=%d, want=1", len(args))
-			}
-
-			switch args[0].(type) {
-			case *object.String:
-				path = args[0].(*object.String).Value
-			default:
-				return newError("argument to `file` not supported, got=%s", args[0].Type())
-			}
-
-			if len(args) > 1 {
-				switch args[1].(type) {
-				case *object.String:
-					mode = args[1].(*object.String).Value
-				default:
-					return newError("argument mode to `file` not supported, got=%s", args[1].Type())
-				}
-			}
-
-			file := &object.File{Filename: path}
-			file.Open(mode)
-			return (file)
-		},
-	},
-}
diff --git a/evaluator/evaluator.go b/evaluator/evaluator.go
index 16ee96b..f52aafc 100644
--- a/evaluator/evaluator.go
+++ b/evaluator/evaluator.go
@@ -3,6 +3,7 @@ package evaluator
 import (
 	"github.com/flipez/rocket-lang/ast"
 	"github.com/flipez/rocket-lang/object"
+	"github.com/flipez/rocket-lang/stdlib"
 
 	"fmt"
 )
@@ -246,7 +247,7 @@ func evalIdentifier(node *ast.Identifier, env *object.Environment) object.Object
 		return val
 	}
 
-	if builtin, ok := builtins[node.Value]; ok {
+	if builtin, ok := stdlib.Builtins[node.Value]; ok {
 		return builtin
 	}
 
diff --git a/object/builtin.go b/object/builtin.go
index 285db4e..b9ef010 100644
--- a/object/builtin.go
+++ b/object/builtin.go
@@ -1,9 +1,12 @@
 package object
 
 type Builtin struct {
-	Fn func(args ...Object) Object
+	Name string
+	Fn   BuiltinFunction
 }
 
+type BuiltinFunction func(args ...Object) Object
+
 func (b *Builtin) Type() ObjectType                                                   { return BUILTIN_OBJ }
 func (b *Builtin) Inspect() string                                                    { return "builtin function" }
 func (b *Builtin) InvokeMethod(method string, env Environment, args ...Object) Object { return nil }
diff --git a/stdlib/exit.go b/stdlib/exit.go
new file mode 100644
index 0000000..74afff0
--- /dev/null
+++ b/stdlib/exit.go
@@ -0,0 +1,20 @@
+package stdlib
+
+import (
+	"os"
+
+	"github.com/flipez/rocket-lang/object"
+)
+
+func exitFunction(args ...object.Object) object.Object {
+	if len(args) != 1 {
+		return newError("wrong number of arguments. got=%d, want=1", len(args))
+	}
+	if args[0].Type() != object.INTEGER_OBJ {
+		return newError("argument to `exit` must be INTEGER, got=%s", args[0].Type())
+	}
+
+	os.Exit(int(args[0].(*object.Integer).Value))
+
+	return nil
+}
diff --git a/stdlib/len.go b/stdlib/len.go
new file mode 100644
index 0000000..6977b41
--- /dev/null
+++ b/stdlib/len.go
@@ -0,0 +1,20 @@
+package stdlib
+
+import (
+	"github.com/flipez/rocket-lang/object"
+)
+
+func lenFunction(args ...object.Object) object.Object {
+	if len(args) != 1 {
+		return newError("wrong number of arguments. got=%d, want=1", len(args))
+	}
+
+	switch arg := args[0].(type) {
+	case *object.Array:
+		return &object.Integer{Value: int64(len(arg.Elements))}
+	case *object.String:
+		return &object.Integer{Value: int64(len(arg.Value))}
+	default:
+		return newError("argument to `len` not supported, got %s", args[0].Type())
+	}
+}
diff --git a/stdlib/open.go b/stdlib/open.go
new file mode 100644
index 0000000..deabcc6
--- /dev/null
+++ b/stdlib/open.go
@@ -0,0 +1,34 @@
+package stdlib
+
+import (
+	"github.com/flipez/rocket-lang/object"
+)
+
+func openFunction(args ...object.Object) object.Object {
+	path := ""
+	mode := "r"
+
+	if len(args) < 1 {
+		return newError("wrong number of arguments. got=%d, want=1", len(args))
+	}
+
+	switch args[0].(type) {
+	case *object.String:
+		path = args[0].(*object.String).Value
+	default:
+		return newError("argument to `file` not supported, got=%s", args[0].Type())
+	}
+
+	if len(args) > 1 {
+		switch args[1].(type) {
+		case *object.String:
+			mode = args[1].(*object.String).Value
+		default:
+			return newError("argument mode to `file` not supported, got=%s", args[1].Type())
+		}
+	}
+
+	file := &object.File{Filename: path}
+	file.Open(mode)
+	return (file)
+}
diff --git a/stdlib/puts.go b/stdlib/puts.go
new file mode 100644
index 0000000..ca99c13
--- /dev/null
+++ b/stdlib/puts.go
@@ -0,0 +1,15 @@
+package stdlib
+
+import (
+	"fmt"
+
+	"github.com/flipez/rocket-lang/object"
+)
+
+func putsFunction(args ...object.Object) object.Object {
+	for _, arg := range args {
+		fmt.Println(arg.Inspect())
+	}
+
+	return nil
+}
diff --git a/stdlib/raise.go b/stdlib/raise.go
new file mode 100644
index 0000000..06c248d
--- /dev/null
+++ b/stdlib/raise.go
@@ -0,0 +1,25 @@
+package stdlib
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/flipez/rocket-lang/object"
+)
+
+func raiseFunction(args ...object.Object) object.Object {
+	if len(args) != 2 {
+		return newError("wrong number of arguments. got=%d, want=2", len(args))
+	}
+	if args[0].Type() != object.INTEGER_OBJ {
+		return newError("first argument to `raise` must be INTEGER, got=%s", args[0].Type())
+	}
+	if args[1].Type() != object.STRING_OBJ {
+		return newError("second argument to `raise` must be STRING, got=%s", args[1].Type())
+	}
+
+	fmt.Printf("🔥 RocketLang raised an error: %s\n", args[1].Inspect())
+	os.Exit(int(args[0].(*object.Integer).Value))
+
+	return nil
+}
diff --git a/stdlib/std.go b/stdlib/std.go
new file mode 100644
index 0000000..343f3e1
--- /dev/null
+++ b/stdlib/std.go
@@ -0,0 +1,31 @@
+package stdlib
+
+import (
+	"fmt"
+
+	"github.com/flipez/rocket-lang/object"
+)
+
+var Builtins = map[string]*object.Builtin{}
+
+var (
+	TRUE  = &object.Boolean{Value: true}
+	FALSE = &object.Boolean{Value: false}
+	NULL  = &object.Null{}
+)
+
+func init() {
+	RegisterFunction("len", lenFunction)
+	RegisterFunction("puts", putsFunction)
+	RegisterFunction("exit", exitFunction)
+	RegisterFunction("raise", raiseFunction)
+	RegisterFunction("open", openFunction)
+}
+
+func RegisterFunction(name string, function object.BuiltinFunction) {
+	Builtins[name] = &object.Builtin{Fn: function}
+}
+
+func newError(format string, a ...interface{}) *object.Error {
+	return &object.Error{Message: fmt.Sprintf(format, a...)}
+}