lower case only first letter of word

[Mengu]

On Tuesday, 5 December 2017 at 14:01:35 UTC, Marc wrote:
> On Tuesday, 5 December 2017 at 13:40:08 UTC, Daniel Kozak wrote:
>> but this will change all other uppercase to lowercase, so 
>> maybe it is not what you want. If you really want just change 
>> first char to upper, then there is nothing wrong to do it 
>> yourself
>>
>> On Tue, Dec 5, 2017 at 2:37 PM, Daniel Kozak 
>> <kozzi11 at gmail.com> wrote:
>>
>>> Something like this: 
>>> https://dlang.org/phobos/std_uni.html#asCapitalized
>>>
>>> On Tue, Dec 5, 2017 at 2:31 PM, Marc via Digitalmars-d-learn 
>>> < digitalmars-d-learn at puremagic.com> wrote:
>>>
>>>> Does D have a native function to capitalize only the first 
>>>> letter of the word? (I'm asking that so I might avoid 
>>>> reinvent the wheel, which I did sometimes in D)
>
> Yes, this is not what I want. I want to convert only the first 
> letter of the word to lower case and left all the others 
> immutable. similar to PHP's lcfirst():
>
> http://php.net/manual/en/function.lcfirst.php

this is how i'd do it:

string upcaseFirst(string wut) {
   import std.ascii : toUpper;
   import std.array : appender;

   auto s = appender!string;
   s ~= wut[0].toUpper;
   s ~= wut[1..$];
   return s.data;
}