rectifiedIndexOf()

[apz28]

On Friday, 5 May 2023 at 00:19:01 UTC, Salih Dincer wrote:
> It has a traditional very beautiful function:  indexOf() but it 
> has an important problem: returns -1 when it can't find 'c'...
>
> ```d
> void main()
> {
>   enum chr = 'c';
>   auto arr = "dlang".dup;
>   if(auto res = arr.indexOf(chr))
>   {
>     assert(arr[res] == chr);
>     // core.exception.ArrayIndexError
>   }
> }
> ```
>
> When you try to solve the problem with boolean logic, res is 
> now a bool.
>
> ```d
> void main()
> {
>   enum chr = 'd';
>   auto arr = "dlang".dup;
>   if(auto res = arr.indexOf(chr) > -1)
>   {
>     assert(arr[res] == chr);
>     // core.exception.AssertError
>   }
> }
> ```
>

Try below
https://gist.github.com/run-dlang/316a1b9df1c14dade4c5ff13c927cc84