Re: What to use instead of array.join if RHS is not a range?

[bearophile]

Andrej Mitrovic:

Is there some other function which can join with an
element as a separator?

This is not efficient, but it's useful to call it inside the 
post-condition of a more efficient version to test the results of 
the faster version:


import std.stdio, std.array;

// 
http://hackage.haskell.org/packages/archive/base/latest/doc/html/src/Data-List.html#intersperse
T[] intersperse(T)(T[] items, T sep) pure nothrow {
    static T[] prependToAll(T[] items, T sep) pure nothrow {
        return items.empty ?
               [] :
               sep ~ (items.front ~ prependToAll(items[1 .. $], 
sep));
    }

    return items.empty ?
           [] :
           items.front ~ prependToAll(items[1 .. $], sep);
}

void main() {
   static struct S { int x; }
   auto arr = [S(2), S(4), S(6)];
   auto s = S(10);
   auto result = arr.intersperse(s);
   writeln(result);
}


Bye,
bearophile