D idom for removing array elements

[Jordan Wilson via Digitalmars-d-learn]

On Sunday, 29 January 2017 at 21:41:57 UTC, albert-j wrote:
> On Saturday, 28 January 2017 at 11:54:58 UTC, cym13 wrote:
>> [...]
>
> I am trying to wrap my head around lazy evaluation during 
> filtering/mapping, but there's something I don't understand.
> I want to create an array, square some elements, remove some 
> elements from original array and add the squared ones to the 
> original array:
>
> [...]

You need to do something like this:
auto arrMap = arr.filter!(x => x > 5).map!(x => x^^2).array;

It's because arrMap is lazy evaluated.