Adding Go's defer to the TypeScript Compiler

3 points by nemin

frontsideair

If I'm not missing anything, we already have the using statement that does the same job.

nemin

Yeah, the article points this out at the end. They are semantically slightly different: defer declares functions that must run at cleanup, while using is more "provide me with a variable and ensure you call its dispose method when it goes out of scope".

quad

We don't just have using, we have DisposableStack:

using stack = new DisposableStack();
await sema.acquire();
stack.defer(() => sema.release());

Or more tightly:

stack.adopt(await sema.acquire(), () => sema.release());

peter-leonov

Real nice language experiment. Love these!

Are you hacking the old TS based compiler or the new Go one?

nemin

Are you hacking the old TS based compiler or the new Go one?

I'm not the author, just found it really interesting :) But he links his repo at the end of the article and it's a modification of the new Go compiler.