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Lists Module
Lists provides list functions. There is a non-standard parallel version available called plists.
Append
append([a,b],[c,d]).
[a,b,c,d]
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]]
Flatten
lists:flatten([[1,2],[3,4]]).
[1,2,3,4]
Fold(left)
3> lists:foldl( fun(X, Prod)-> X*Prod end, 1, [1,2,3,4,5]).
120
Foldr, fold right
3> lists:foldr( fun(X, Prod)-> X*Prod end, 1, [1,2,3,4,5]).
120
Foreach(Fun, List)
41> lists:foreach( fun(X) -> X*X end, [1,2,3,4,5]).
>
No answer is returned because the purpose is to run side effects.
42> lists:foreach( fun(X) -> io:format("~w ",X) end, [1,2,3,4,5]).
1 2 3 4 5
Last
lists:last([1,2,3]).
3
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]
Mapfold(left)
lists:mapfoldl(fun(X,Prod)->{X,X*Prod} end, 1, [1,2,3,4,5]).
{[1,2,3,4,5], 120}
Mapfold(right)
lists:mapfoldr(fun(X,Prod)->{X,X*Prod} end, 1, [1,2,3,4,5]).
{[1,2,3,4,5], 120}
Nth
lists:nth(1,[a,b,c]).
a
Nthtail
lists:nthtail(2,[a,b,c,d]).
[c,d]
Sort
Note: sort will work with any combination of types. Each type has a natural sort order.
lists:sort([2,4,3,5]).
[2,3,4,5]
lists:sort([1, 2, b, a, self(), fun()->true]).
[1, 2, a, b, #Fun<erl.20.117942222>, <0,176,0>]
