Map Lambda with Side-Effects

[bearophile via Digitalmars-d-learn]

ketmar:

> in no way. this just turns Phobos into the same unusable crap, 
> removing the whole sense of having good standard library.

If your language has purity, and it doesn't use it where it 
matters, you have removed its sense of having purity. So if you 
are right then purity in D is useless and Rust has chosen better 
than D on this.

Bye,
bearophile