description

# splitMapJoin method Null safety

String splitMapJoin (

1. Pattern pattern,
2. {String onMatch(
   1. Match
   ),
3. String onNonMatch(
   1. String
   )}

)

Splits the string, converts its parts, and combines them into a new string.

`pattern` is used to split the string into parts and separating matches.

Each match is converted to a string by calling `onMatch`. If `onMatch` is omitted, the matched string is used.

Each non-matched part is converted by a call to `onNonMatch`. If `onNonMatch` is omitted, the non-matching part is used.

Then all the converted parts are combined into the resulting string.

    'Eats shoots leaves'.splitMapJoin((new RegExp(r'shoots')),
        onMatch:    (m) => '${m.group(0)}',
        onNonMatch: (n) => '*'); // *shoots*

## Implementation

    String splitMapJoin(Pattern pattern,
        {String Function(Match)? onMatch, String Function(String)? onNonMatch});