[Gaelan]

Is Rust mainstream? If so, this code:

    numbers.iter().map(|n| { ... }).sum();

Compiles to a plain loop, with no allocation.

[steveklabnik]

(You want for_each not map, by the way)

[Gaelan]

Wait, why? AFIAK for_each doesn't return another iterator, and I'm calling sum afterward.

[steveklabnik]

.... hacker news cut off the “sum” part, and so I didn’t see it. On my phone it just happened to clip it exactly long enough that it was still valid syntax, wow. Anyway, sorry and my bad!