aborting-thread-macro.clj

; I love the thread macro ... but sometimes I want to abort the chain of execution.
(-> some-data
    transformation-a
    transformation-b  ; returns false, and I don't want to run the others!
    transformation-c
    transformation-d)

; ... for example, if the result of one of the functions is falsey, don't continue
(bool-> some-data
        transformation-a
        transformation-b ; returns false, so transformation-c and -d are never run
        transformation-c
        transformation-d)

; ... or even better yet, let me define a function that is run after every step in the chain,
; and determines if execution continues.
(defn continue? [x] ( ... ))
(cond-> some-data
        continue?
        transformation-a
        transformation-b ; returns a value that continue? decides should halt further execution
        transformation-c
        transformation-d)