# Threading Macro

- [[thread-first]]
- [[thread-last]]

## Don'ts

[[Navigation]], [[Transformation]], and [[Sequence]]: That's it for the "do's." The rest are all "don'ts."

### Don't mix -> and ->>

### Don't thread arithmetic

### Don't use anonymous functions to change argument position

<code clojure>
;; BAD
(-> results
    :matches
    (#(filter wining-match? %)) ; BAD
    (nth 3)
    :scores
    (get "total_points"))
    
;; BETTER
(let [wins (filter winning-match? (:matches results))]
  (-> wins
      (nth 3)
      :scores
      (get "total_points")))
</code>

### Don't mix threading macros with other syntactic macros



## Docs

- [[clojure.spec]]