accessing Clojure's thread-first macro arguments

  • A+
Category:Languages

I was wondering if there was a way to access the arguments value of a thread-first macro in Clojure while it is being executed on. for example:

(def x {:a 1 :b 2}) (-> x     (assoc :a 20) ;; I want the value of x after this step     (assoc :b (:a x))) ;; {:a 20, :b 1} 

It has come to my attention that this works:

(-> x      (assoc :a 20)      ((fn [x] (assoc x :b (:a x))))) ;; {:a 20, :b 20} 

But are there any other ways to do that?

 


You can use as->:

(let [x {:a 1 :b 2}]     (as-> x it         (assoc it :a 20)                                                      (assoc it :b (:a it))))  

Comment

:?: :razz: :sad: :evil: :!: :smile: :oops: :grin: :eek: :shock: :???: :cool: :lol: :mad: :twisted: :roll: :wink: :idea: :arrow: :neutral: :cry: :mrgreen: