CODEWITHSUNDEEP
clojure
Nathan
Nathan

Reputation: 78549

How to combine a let binding and an if statment in Clojure

I'm learning Clojure, and trying to figure out the language to write things concisely and clearly. I'm trying to conditionally do something with a value after getting a value (say from a database) from a function that either returns the value or nil. I'm currently using a let binding, and then an if statement. Here is something similar to what I have currently:

(defn foo [key]
  (let [result (try-getting! key)]
    (if result
      (+ result 50)
      50)))

I'm trying to figure out if there is a more consise way to do this, perhaps some sort of combined if-let binding? Is there a way to write this better?

Thanks!

Upvotes: 2

Views: 378

Answers (2)

Jarlax
Jarlax

Reputation: 1576

There is form if-let for this:

(defn foo [key]
  (if-let [result (try-getting! key)]
    (+ result 50)
    50))

Upvotes: 8

noisesmith
noisesmith

Reputation: 20194

Yes, in fact if-let is what you want here.

 (if-let [result (try-getting! key)]
   (+ result 50)
   50)

Upvotes: 5

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