Erlang lists:index_of function?

Question

I\'m looking for an Erlang library function that will return the index of a particular element in a list.

So, if

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Answer 1

The following function returns a list of indices of a given element in a list. Result can be used to get the index of the first or last occurrence of a duplicate element in a list.

indices_of(Element, L) ->                                                                                                                                                          
    Indices = lists:zip(lists:seq(1,length(L)), L),                                                                                                                                
    [ I || {I, E} <- Indices, E == Element ].