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Programming-Idioms

History of Idiom 20 > diff from v19 to v20

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Version 19

2015-09-04, 19:23:04

Version 20

2015-09-04, 19:23:46

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 
searcb x m = head [ (i, j) | (i, r) <- zip [0..] m,
					(j, c) <- zip [0..] r, c == x]
Code 
searcb x m = head [ (i, j) | (i, r) <- zip [0..] m,
                             (j, c) <- zip [0..] r, c == x]