clojure+.core — io.github.tonsky/clojure-plus 1.0.1

cond+ clj macro

(cond+ & clauses)

Cond on steroids.

Define new variables between conditions:

(cond+ false :false :let [x 1] (= 1 x) (str x)) ; => "1"

Insert imperative code:

(cond+ (= 1 a) :false :do (println a) ; will print 1 :else :true)

Declare variables inside conditions, just like if+:

(cond+ (and (= 1 1) :let [x 2, y (+ x 1)] (> y x)) [x y]) ;; => [2 3]

if+ clj macro

(if+ cond then)

(if+ cond then else)

Allows sharing local variables between condition and then clause.

Use :let [...] form (not nested!) inside and condition and its bindings will be visible in later and clauses and inside then branch:

(if+ (and (= 1 2) ;; same :let syntax as in doseq/for :let [x 3 y (+ x 4)] ;; x and y visible downstream (> y x))

;; “then” branch: x and y visible here!
(+ x y 5)

;; “else” branch: no x nor y
6)

when+ clj macro

(when+ cond & body)

Allows sharing local variables between condition and body clause.

Use :let [...] form (not nested!) inside and condition and its bindings will be visible in later and clauses and inside body:

(when+ (and (= 1 2) ;; same :let syntax as in doseq/for :let [x 3 y (+ x 4)] ;; x and y visible downstream (> y x))

;; “then” branch: x and y visible here!
(+ x y 5))