Re: Alternate signs in a range

[bearophile]

Stanislav Blinov:

We need generic enumerate() in Phobos :(

It will come soon :-)
https://github.com/D-Programming-Language/phobos/pull/1866
(Take a look at my comment about foreach there)


This also shows we need a good syntax to unpack tuples:

void main() {
        auto myRange = iota(0,10);

auto result = myRange.enumerate.map!(a => a[0] & 1 ? -a[1] : a[1]);

        result.writeln;
}

It could be written like:

myRange.enumerate.map!(t{i, x} => i % 2 ? -x : x);

Bye,
bearophile