Logo

Programming-Idioms

History of Idiom 20 > diff from v17 to v18

Edit summary for version 18 by :

Version 17

2015-09-04, 19:10:34

Version 18

2015-09-04, 19:16:44

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
x`search`m=head[(i,j)|(i,r)<-zip[0..]m,(j,c)<-zip[0..]r,c==x]
Code
searcb x m = let i = findIndex (elem x) m; j = elemIndex x (m!!i) in (i, j)