Erlang list question

Question

I have a list with tuples in Erlang for example:

[{1, "AAA"}, {2, "AAA"}, {3, "AAAAAAAA"}]

How can i get tuple from this list with max first element from this tuples?

Thank you.

score 5 · Answer 1 · edited Apr 27 '11 at 20:02

5

In this case lists:max/1 will return what you want. For this to work all tuples must have the same number of elements.

edited Apr 27 '11 at 20:02

Roberto Aloi

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answered Apr 27 '11 at 11:02

Arjan

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score 3 · Accepted Answer · edited May 23 '17 at 10:24

Use lists:keysort/2.

1> lists:keysort(1, [{1, "AAA"}, {2, "AAA"}, {3, "AAAAAAAA"}]).

Another thread

edit: Seems I read your questions to fast. If you only want one tuple containing a maximum value and your tuples are of same size Arjan should be the accepted answer.

If you only want one term() element containing a maximum value, and if the rule with similar tuple-sizes Arjan stated doesn't apply, I would go with either a lists:foldl/3 or own recursion function.

Sorting the whole list is unnecessary unless you want the whole list sorted. My mistake.

Erlang list question

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