:sig
template<typename F> StringList StringList::map(F f) const

:params
f : mapper called with each String
return value : new list of mapped strings

:see
0_StringList
2_StringList_filter

:content
Returns a new `StringList` containing the mapper result for each item, in the same order.

```cpp
StringList upper = names.map([](String s) { return(to_upper(s)); });
```