Converting a character to upper case in string

[Gary Willoughby]

On Friday, 21 September 2018 at 12:15:52 UTC, NX wrote:
> How can I properly convert a character, say, first one to upper 
> case in a unicode correct manner?
> In which code level I should be working on? Grapheme? Or maybe 
> code point is sufficient?
>
> There are few phobos functions like asCapitalized() none of 
> which are what I want.

Use `asCapitalized` to capitalize the first letter or use 
something like this:


import std.conv;
import std.range;
import std.stdio;
import std.uni;

void main(string[] args)
{
	string input = "noe\u0308l";
	int index    = 2;

	auto graphemes    = input.byGrapheme.array;
	string upperCased = [graphemes[index]].byCodePoint.text.toUpper;

	graphemes[index] = upperCased.decodeGrapheme;
	string output    = graphemes.byCodePoint.text;

	writeln(output);
}