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Programming-Idioms

History of Idiom 20 > diff from v10 to v11

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Version 10

2015-08-20, 18:25:54

Version 11

2015-08-21, 16:18:23

Idiom #20 Return two values

Implement a function search which looks for item x in a 2D matrix m.
Return indices i, j of the matching cell.
Think of the most idiomatic way in the language to return the two values at the same time.

Idiom #20 Return two values

Implement a function search which looks for item x in a 2D matrix m.
Return indices i, j of the matching cell.
Think of the most idiomatic way in the language to return the two values at the same time.

Code 
class Position {
  int i, j;
  Position(this.i, this.j);
}
Position search(List<List> m, x) {
  for (var i = 0; i < m.length; i++) {
    var line = m[i];
    for (var j = 0; j < line.length; j++) {
      if (line[j] == x) {
        return new Position(i, j);
      }
    }
  }
  return null;
}