[Released] NOPE (No Overused Possibly Evil Exceptions): A Zero-Allocation Functional Extensions Library

NOPE -No Overused Possibly Evil Exceptions-

Do you hate dealing with random nulls and unexpected Exception spam all over your code? Meet NOPE—short for No Overused Possibly Evil Exceptions—a lightweight library that aims to eliminate exception overuse while keeping your code clean, explicit, and highly readable.

Key Highlights:

  • Result<T,E> for explicit success/failure: No more hidden throws or magical null returns.
  • Maybe for optional values: Get rid of null checks and safely chain transformations.
  • Zero-Allocation & Performant: Written as readonly struct to keep runtime costs low.
  • Sync/Async Bridges: Complete support for UniTask (NOPE_UNITASK) or built-in Awaitable (NOPE_AWAITABLE on Unity 6+).
  • Safe Methods: BindSafe, MapSafe, TapSafe catch exceptions internally, returning a failure result instead of crashing.

Quick Comparison

Before NOPE

public async Task<string> DoStuff()
{
    // a) check some condition
    if (!CheckA()) 
        throw new Exception("Condition A failed!");

    // b) fetch data
    var data = await FetchData(); // might return null?
    if (data == null)
        return null; // ?

    // c) parse & validate
    var parsed = Parse(data);
    if (parsed <= 0)
        return "Negative value?";

    // d) do final step
    if (!await FinalStep(parsed))
        return "Final step failed!";
    
    return "All Good!";
}

After NOPE

Why Use NOPE?

  • Improves clarity by distinguishing success and failure at each step, rather than abruptly throwing exceptions.
  • Allows functional-style chaining (“Railway Oriented Programming”), making error handling straightforward and predictable.
  • Lets you keep “outside” errors (network, user input, file I/O) from polluting your core game logic.
  • Supports custom error types, so you can define your own error severity, messages, or codes and keep a consistent error-handling strategy across your team.

Get Started:

  • GitHub Repository – includes installation guide, performance benchmarks, and API reference.
  • Available via OpenUPM or direct Git UPM links.
  • Fully MIT Licensed & ready for contributions!

If you’re looking for a way to make error handling more explicit, readable, and flexible—give NOPE a try! Feel free to ask any questions or share feedback. Happy coding!