join method Null safety

String join(
  1. String part1,
  2. [String? part2,
  3. String? part3,
  4. String? part4,
  5. String? part5,
  6. String? part6,
  7. String? part7,
  8. String? part8]
)

Joins the given path parts into a single path. Example:

context.join('path', 'to', 'foo'); // -> 'path/to/foo'

If any part ends in a path separator, then a redundant separator will not be added:

context.join('path/', 'to', 'foo'); // -> 'path/to/foo

If a part is an absolute path, then anything before that will be ignored:

context.join('path', '/to', 'foo'); // -> '/to/foo'

Implementation

String join(String part1,
    [String? part2,
    String? part3,
    String? part4,
    String? part5,
    String? part6,
    String? part7,
    String? part8]) {
  final parts = <String?>[
    part1,
    part2,
    part3,
    part4,
    part5,
    part6,
    part7,
    part8
  ];
  _validateArgList('join', parts);
  return joinAll(parts.whereType<String>());
}