Casting MapResult

[jmh530 via Digitalmars-d-learn]

On Monday, 15 June 2015 at 19:04:32 UTC, Baz wrote:
> In addition to the other answers you can use 
> std.algorithm.iteration.each():
>
> ---
> float[] _exp(float[] x) {
>     auto result = x.dup;
>     result.each!(a => exp(a));
>     return result;
> }
> ---

Am I right that the difference is that map is lazy and each is 
greedy? Does that have any significant performance effects?