String.splitMap

[Hixie]

There's a String.splitMapJoin method, but when turning a string into a bunch of widgets it would be useful to have a String.splitMap method.

Iterable<T> splitMap<T>(Pattern pattern, {
  T onMatch(Match match),
  T onNonMatch(String nonMatch),
});

The existing splitMapJoin method is then implementable as:

String splitMapJoin(Pattern pattern, {
  String onMatch(Match match),
  String onNonMatch(String nonMatch),
}) => splitMap<String>(pattern, onMatch: onMatch, onNonMatch: onNonMatch).join('');

The splitMap concept would be very useful when, e.g., replacing URLs with clickable links in widget build methods (where you have to turn the incoming string into a list of TextSpans).

[lrhn]

Interesting idea.
It does make sense as a kind of general string parser (split around patterns, handle matches and non-matches individually) where you can choose what to do with each.

[simonhoward-2]

Second this request. Given there is already splitMapJoin, it seems logical to have the sub functionality available too.
Currently this has to be achieved with something as follows:

var split = text
      .splitMapJoin(
        RegExp(r'\[url=.*\]'),
        onMatch: (m) => '#${m[0]}#',
        onNonMatch: (m) => m,
      )
      .split('#');