fn

Creates a new lambda function

(fn [params*] exp*)

Creates a new lambda function. You can store this using `def` keyword and call it later. See examples

params - lambda parameters, ex: `[param1, param2]`

exp - any number of expressions. Last expression will be the return value when lambda get's evaluated.

There is a short version of fn

[x] => (* x 2) => (fn [x] (* x 2))

(def add (fn [a, b] (+ a b)))
(add 2 3)
;;=> 5

(map (fn [x] (* x 2)) [1, 2, 3, 4])
;;=> [2, 4, 6, 8]

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