[Issue 8715] map, filter, zip with functional arrays/associative arrays

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=8715


bearophile_hugs at eml.cc changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|zipWith                     |map, filter, zip with
                   |                            |functional
                   |                            |arrays/associative arrays


--- Comment #5 from bearophile_hugs at eml.cc 2012-12-13 02:53:58 PST ---
Another example:

import std.stdio: writeln;
import std.algorithm: map, filter;
void main() {
    int[] data = [0, 1, 2, 3];
    bool[] mask = [true, false, true, false];
    int[int] conv = [0:10, 1:20, 2:30, 3:40];
    auto r1 = data
              .filter!(i => mask[i])()
              .map!(i => conv[i])();
    writeln(r1); // Prints: [10, 30]
}


This is nicer:

import std.stdio: writeln;
import std.algorithm: map, filter;
void main() {
    int[] data = [0, 1, 2, 3];
    bool[] mask = [true, false, true, false];
    int[int] conv = [0:10, 1:20, 2:30, 3:40];
    auto r2 = data.filter!mask().map!conv();
    writeln(r2);
}

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