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Programming-Idioms

History of Idiom 20 > diff from v14 to v15

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Version 14

2015-09-03, 17:30:08

Version 15

2015-09-04, 18:58:20

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
search x m = head [ (i, j) | (i, row) <- zip [0..] m, (j, cell) <- zip [0..] row, cell == x]