my_let.clj

(defmacro my-let
  [bindings & body]
  (assert (-> bindings count even?) "Bindings count can only be even.")
  `((fn [~@(take-nth 2 bindings)]
      ~@body)
    ~@(take-nth 2 (rest bindings))))

One of the ways to implement let is to create a temporary function scope that will have required
bindings, and call this function with params that represent arguments.

For example, if you have bindings like [a 1 b 2], you'll take a and b as variable names (bindings),
and 1 and 2 as values, that you'll call function with.

This means that our let will expand:

(let [a 1
      b 2]
  (println (+ a b)))

To:

((fn [a b]
    (println (+ a b)))
 1 2)