How do you sort pairs in a list based on a nested value?

Question

Given the following list in Clojure:

(def pairs '[(2,1),(3,2),(2,4)])

I want to sort these in descending order based on the second item in each pair.

ie I want them to sort into:

[(2,4),(3,2),(2,1)]   

My question is: How do you sort pairs in a list based on a nested value?

Answer 1

Use sort-by:

(sort-by second > pairs)