Named parameters in anonymous Clojure functions?

Question

I am learning about closures in Clojure and this function confused me:

(defn inc-maker
  "Create a custom incrementor"
  [inc-by]
  #(+ % inc-by))

(def inc3 (inc-maker 3))

(inc3 7)
; => 10

As a JavaScript developer I couldn't figure out how the argument 7 was getting passed in because in Javascript you would have to write it like this:

const incMaker = incByX => incByY => incByX + incByY;

const incThree = incMaker(3);

incThree(7);

So my question is, and not that I'm wanting to turn Clojure in to Javascript, but is there a way to name parameters in anonymous Clojure functions?

Amanuel Nega · Accepted Answer · 2019-08-30 08:57:13Z

3

You could be a little more verbose about how you declare your anonymous function.

#(+ % inc-by)

is actually expanded to an equivalent form such as

(fn [n] (+ n inc-by))

If you use %1, %2 etc, the expanded function will have more parameters.

You can find some example on this documentation

edited Aug 30, 2019 at 8:57

Amanuel Nega

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answered Aug 30, 2019 at 8:15

David Smith

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