Clojure for the Brave and True

It is better to have 100 functions operate on one data structure than 10 functions on 10 data structures.
—Alan Perlis

let creates a new scope in which the name x is bound to the value 1. I think of scope as

You can also pass a rest parameter with %&:

(#(identity %&) 1 "blarg" :yip); => (1 "blarg" :yip)

strange-looking style of writing anonymous functions is made possible by a feature called reader macros.

Clojure also offers another, more compact way to create anonymous functions. Here’s what an anonymous function looks like:

#(* % 3)
Whoa, that looks weird. Go ahead and apply that weird-looking function:

(#(* % 3) 8); => 24

Clojure also offers another, more compact way to create anonymous functions. Here’s what an anonymous function looks like:

#(* % 3)

fact, you’ll use anonymous functions all the time. How mysterious! You create anonymous functions in two ways. The first is to use the fn form:

(fn [param-list] function body)

Clojure automatically returns the last form evaluated.

Clojure on how to associate names with values in a list, map, set, or vector

(defn announce-treasure-location [{:keys [lat lng]}] (println (str "Treasure lat: " lat)) (println (str "Treasure lng: " lng)))