restructure project

internal/builtins/assert.go

@@ -0,0 +1,26 @@
+package builtins
+
+import (
+	"fmt"
+	"monkey/internal/object"
+	"monkey/internal/typing"
+	"os"
+)
+
+// Assert ...
+func Assert(args ...object.Object) object.Object {
+	if err := typing.Check(
+		"assert", args,
+		typing.ExactArgs(2),
+		typing.WithTypes(object.BOOLEAN_OBJ, object.STRING_OBJ),
+	); err != nil {
+		return newError(err.Error())
+	}
+
+	if !args[0].(*object.Boolean).Value {
+		fmt.Printf("Assertion Error: %s", args[1].(*object.String).Value)
+		os.Exit(1)
+	}
+
+	return nil
+}