[Issue 13958] RangeError with impure map

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13958

bearophile_hugs at eml.cc changed:

           What    |Removed                     |Added
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                 CC|                            |bearophile_hugs at eml.cc

--- Comment #1 from bearophile_hugs at eml.cc ---
The short answer: do not use impure functions in higher order functions like
map/filter, unless you know what you are doing (and you usually don't).

So it's better to find a pure way to solve your problem, like:

void main() {
    import std.stdio, std.algorithm, std.array, std.range;

    static a = ["a", "b", "c", "d", "e", "f", "g", "h", "i"];
    zip(a, a).map!(p => p[0] ~ p[1]).joiner(", ").writeln;
}

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