to compose or hack?

[Steven Schveighoffer]

On 7/7/21 3:52 PM, Sebastiaan Koppe wrote:
> On Wednesday, 7 July 2021 at 13:30:28 UTC, Steven Schveighoffer wrote:
>> On 7/7/21 5:54 AM, rassoc wrote:
>>> On Wednesday, 7 July 2021 at 01:44:20 UTC, Steven Schveighoffer wrote:
>>>> So I have this situation where I need to split a string, then where 
>>>> the splits are, insert a string to go between the elements making a 
>>>> new range, all without allocating (hopefully).
>>>>
>>>
>>> Without considering the more general case, isn't that just 
>>> splitter-joiner?
>>
>> No, splitter-joiner would make a range of characters, I want a range 
>> of strings.
> 
> Just lift each item in a range then:
> 
> ```d
> import std;
> 
> auto foo(string s, string sp, string j) @nogc {
>       return s.splitter(sp).map!(i => only(i)).joiner(only(j));
> }
> 
> void main() {
>       foo("ab,cd,ef,gh", ",", "##").writeln; // => ["ab", "##", "cd", 
> "##", "ef", "##", "gh"]
> }
> ```

Thanks! This is exactly what I was reaching for. `only` is one of the 
coolest functions (I use it elsewhere too).

-Steve