Erlang (programming language)/Tutorials/Lists: Difference between revisions

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imported>Eric Evers
imported>Eric Evers
Line 2: Line 2:


=Lists Module=
=Lists Module=
Lists provides list functions. There is a non-standard parallel version available called plists.
==Filter==
1> F1 = fun(Item) -> length(Item) > 1 end.
#Fun<erl_eval.6.58606484>
2> lists:filter(F1, [[1],[1,2],[1,2,3]]).
[[1,2,3],[1,2]]


==Map==
==Map==

Revision as of 13:34, 2 June 2008


Lists Module

Lists provides list functions. There is a non-standard parallel version available called plists.

Filter

1> F1 = fun(Item) -> length(Item) > 1 end. 
#Fun<erl_eval.6.58606484>
2> lists:filter(F1, [[1],[1,2],[1,2,3]]).
[[1,2,3],[1,2]]

Map

6> Sqrt = fun(X) -> math:sqrt(X) end.
#Fun<erl_eval.6.56006484>
7> lists:map(Sqrt,[1,2,3,4]).
[1.00000,1.41421,1.73205,2.00000]

Sort

lists:sort([2,4,3,5]).
[2,3,4,5]