ObjectiveScript is a powerful superset of JavaScript, which enables extensive interaction with C and Objective-C code.

Amongst the various features supported, a few highlights are

  • Objective-C
    • First-class swizzling support similar to that of Logos
    • Method calling using Objective-C syntax
    • Creating new Objective-C classes
  • C
    • Support for calling pure C functions, including variadic ones
    • Built-in interaction with C structures
    • Pointer support
  • General
    • Powerful type inference and hinting system
    • Support for declaring and calling blocks


At first glance, it might seem redundant to create a new programming language to interact with C and Objective-C; what's wrong with directly writing a program in Objective-C?

The primary motivation boils down to a simple fact: JavaScript can be interpreted at runtime.

This opens up a wide range of possibilities, such as

  • Situations where bundling a full-fledged compiler would be too bulky or slow
  • Avoiding the need for code-signing while executing code on systems where it's traditionally mandatory
  • Dynamic code execution in cases where remapping pages as executable is disallowed

Example use cases include

  • An app which allows users to build runtime modifications (tweaks) for other iOS apps without needing to jailbreak or use a computer
  • An on-device IDE for coding native iOS apps
  • A REPL for debugging apps at runtime in a syntax more familiar to developers than that of LLDB.

The initial motivation for building ObjectiveScript was the first of these examples, and you can download the preview version right now: Supercharge.