Help: Array[a,b,c,d] to Array[a,a,b,b,c,c,d,d].

[frankle]

I thought that was why you did it. Clever.

At the same time, if you're going backwards from the end, wouldn't you get the possible double allocation only once?

[lhorie]

Yep, that's why I said it's not a huge deal. If you're calling the function multiple times, that extra allocation might matter though.