Best approach to handle accented letters

[Alfred Newman via Digitalmars-d-learn]

On Friday, 28 October 2016 at 11:40:37 UTC, Chris wrote:
> On Friday, 28 October 2016 at 11:24:28 UTC, Alfred Newman wrote:
>> Hello,
>>
>> I'm getting some troubles to replace the accented letters in a 
>> given string with their unaccented counterparts.
>>
>> Let's say I have the following input string "très élégant" and 
>> I need to create a function to return just "tres elegant". 
>> Considering we need to take care about unicode chars, what is 
>> the best way to write a D code to handle that ?
>>
>> Cheers
>
> You could try something like this. It works for accents. I 
> haven't tested it on other characters yet.
>
> import std.stdio;
> import std.algorithm;
> import std.array;
> import std.conv;
>
> enum
> {
>   dchar[dchar] _accent = ['á':'a', 'é':'e', 'è':'e', 'í':'i', 
> 'ó':'o', 'ú':'u', 'Á':'A', 'É':'E', 'Í':'I', 'Ó':'O', 'Ú':'U']
> }
>
> void main()
> {
>   auto str = "très élégant";
>   auto removed = to!string(str.map!(a => (a in _accent) ? 
> _accent[a] : a));
>   writeln(removed);  // prints "tres elegant"
> }

@Chris

As a new guy in the D community, I am not sure, but I think the 
line below is something like a Python's lambda, right ?

auto removed = to!string(str.map!(a => (a in _accent) ? 
_accent[a] : a));

Can you please rewrite the line in a more didatic way ? Sorry, 
but I'm still learning the basics.

Thanks in advance