How to partial conj?

Question

I'm trying to create a function that applies several processes to a map, including adding / updating some standard items to each map using "conj". I'm doing it by composing several other functions using "comp".

So I tried doing this

(defn everything [extra] (comp (partial conj {:data extra}) another-func) )

Which won't work because conj wants the extra data as the second argument, not the first.

I assume there should be a similarly straightforward way of composing a curried conj, but I can't quite figure out how to do it.

`#(conj % {:data extra})` doesn't work? – Charles Duffy May 10 '14 at 21:52 — Charles Duffy, May 10 '14 at 21:52
Yes ... perfectly ... didn't think of it. :-) – interstar May 10 '14 at 22:09 — interstar, May 10 '14 at 22:09
...then I'll make it an answer. :) – Charles Duffy May 10 '14 at 22:10 — Charles Duffy, May 10 '14 at 22:10

Charles Duffy · Accepted Answer · 2014-05-10T22:22:51.033

3

Easiest is just to write an anonymous function:

(defn everything [extra]
  (comp #(conj % {:data extra}) another-func))

edited May 10 '14 at 22:22

answered May 10 '14 at 22:10

Charles Duffy

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How to partial conj?

1 Answers1