counting characters

[celavek via Digitalmars-d-learn]

On Tuesday, 19 July 2016 at 09:55:43 UTC, Jonathan M Davis wrote:
> On Tuesday, July 19, 2016 09:41:32 John via Digitalmars-d-learn 
> wrote:
>
> auto result = count(dna_chain, 'A');
>
> or if you know that the string is always going to just contain 
> ASCII (as seems likely based on the example), then 
> string.representation can be used to convert the string to 
> immutable(ubyte)[] in order to avoid the auto-decoding that 
> occurs with string and range-based functions. e.g.
>
> auto result = count(dna_chain.representation, 'A');
>
> That's almost certainly the fastest way to do it with Phobos.
>
> - Jonathan M Davis

Thank you. I used what you suggested as I have only ASCII 
characters.