Insert a char in string

[via Digitalmars-d-learn]

On Thursday, 10 July 2014 at 16:20:29 UTC, Alexandre wrote:
> Sorry..
> I mean:
>
> auto X = "100000000000000";
> auto N = X.insertInPlace(3,',');
>
> On Thursday, 10 July 2014 at 16:05:51 UTC, Alexandre wrote:
>> I have a string X and I need to insert a char in that string...
>>
>> auto X = "100000000000000";
>>
>> And I need to inser a ',' in position 3 of this string..., I 
>> try to use the array.insertInPlace, but, not work...
>>
>> I try this:
>> auto X = "100000000000000";
>> auto N = X.insertInPlace(1,'0');

`std.array.insertInPlace` doesn't return anything. "In place" 
here means "in situ", i.e. it will not create a new string, but 
insert the new elements into the existing one. This operation may 
still reallocate, in which case the array slice you're passing in 
will be updated to point to the new memory.

Either use this instead:

     auto x = "100000000000000";
     auto n = x.dup;
     n.insertInPlace(3, ',');
     // or: insertInPlace(n, 3, ',');

... or use slicing and concatenating to construct a new string:

     auto g = x[0 .. 3] ~ ',' ~ x[3 .. $];

(Side note about style: It's common practice to use lower-case 
names for variables, upper-case first letters are used to denote 
types. But of course, that's a matter of taste.)