Op vrijdag 24 oktober 2014 14:09:13 UTC+2 schreef Laurens Van Houtven: > > Hi Roelof, > > On 24 Oct 2014, at 14:05, Roelof Wobben <rwo...@hotmail.com <javascript:>> > wrote: > > > I have to use map and get a vector of all the second items in a list. > > I know I can use map to do things with all the items in a list. > > and with get I can get the second item (get collection 1) > > Yes, depending on what the items in the list are. For vectors, for > example, that will work. > > > map uses this map what_has _to_be_done collection > > > > so I thougt this would work (map (get collection 1) collection) > > but then I see this error message : > java.lang.IllegalArgumentException: Key must be integer > > You are applying get to a real collection. map takes a function to be > applied to each element. For example, #(get % 1). > > More idiomatic: (map second xs). > > cheers > lvh > > oke, and second could be the helper function. I know what schould be done map has to pick up the items and on that item I have to be doing the get.
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