Algebraic Data Types: Things I wish someone had explained about FP

Re:Algebraic Data Types: Things I wish someone had explained... by uryga on Tuesday November 19, 2019 @11:41AM (#21574946)

i had no idea rust supported laziness! how does that work?

[ Parent | on HN ]

Re:Algebraic Data Types: Things I wish someone had explained... by cies on Tuesday November 19, 2019 @05:11PM (#21578854)

I think he refers to async recently landing in Rust.

Here the Rust book mentions it:

> async bodies and other futures are lazy: they do nothing until they are run.

https://rust-lang.github.io/async-book/03_async_await/01_cha...

I just read it, and thought it was odd. I don't understand how Rust's async relates to a laziness as in Haskell's laziness.

[ Parent | on HN ]

Re:Algebraic Data Types: Things I wish someone had explained... by steveklabnik on Tuesday November 19, 2019 @06:34PM (#21579562)

Iterators are also lazy.

All of these things build up some form of computation that doesn’t execute until later. Until then, they’re represented by some kind of data structure.

[ Parent | on HN ]