threading through a vector of functions [duplicate]

Question

I have a vector of functions (def my-func [a b c d]). Each function takes the output of the last function as the input. I want to thread an input through them, how do I do that?

How do I get to the following form (-> in a b c d)?

Thanks, Murtaza

Answer 1

You can use comp but be aware it executes the functions right to left

((comp d c b a) 10)

or

((apply comp my-fns) 10)

will pass 10 to the first function, the result to the next function and so on.

Answer 2

I think you can use the reduce function:

(def fns [inc inc inc])
(reduce (fn [v f] (f v)) 10 fns)