How to loop through characters of a string in D language?

Stanislav Blinov stanislav.blinov at
Thu Dec 23 16:13:49 UTC 2021

On Thursday, 23 December 2021 at 07:14:35 UTC, Salih Dincer wrote:

> It seems faster than algorithms in Phobos. We would love to see 
> this in our new Phobos.
> ```d
>   void mallocReplace()

>   void normalReplace()
>     string result = str.replace(';',"");
> }/* Console Out:
> Replace: 436 msecs
> Malloc : 259 msecs
> */
> ```

You're comparing apples and oranges. When benchmarking, at least 
look at the generated assembly first.

replace is not in Phobos, it's a D runtime vestige. It's not 
getting inlined even in release builds with lto, whereas that 
manual version would. Also, benchmark with runtime strings, not 
literals, otherwise the compiler might even swallow the thing 

What you're benchmarking is, basically, inlined optimized search 
in a literal versus a function call.

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