On Tue, Jan 07, 2014 at 08:38:10PM +0000, Craig Dillabaugh wrote:
[...]
> As someone with little experience with functional programming, I am
> just curious - having browsed through the thread - if the various
> solutions proposed here would really be considered more 'idiomatic'
> D. Or if they were posted because the OP asked about avoiding the
> foreach() loop.
>
> In other words while:
>
> auto range = aa.byKey.map!(a => chain(a.only, aa[a].only));
> string[] array = range.join;
>
> Saves a few lines of code, and looks cooler, it seems that the
> trivial foreach loop version is very easy:
>
> string[] array;
>
> foreach (key, value; aa) {
> array ~= key;
> array ~= value;
> }
[...]
Even better, encapsulate this in a function:
CommonType!(K,V)[] aaToArray(K,V)(V[K] aa)
if (is(CommonType!(V, K)))
{
typeof(return) result;
foreach (key, value; aa) {
result ~= key;
result ~= value;
}
return result;
}
Then you can use it in a single line next time:
string[] arr = aaToArray(["a": "aa", "b" : "bb"]);
int[] arr = aaToArray([1: 2, 3: 4]);
... // etc.
T
--
Real men don't take backups. They put their source on a public
FTP-server and let the world mirror it. -- Linus Torvalds
