How to remember the difference between conj and cons in Clojure

When I started writing Clojure, I couldn’t memorize the difference between conj and cons and always used one instead of the another. Their name are similar, but cons is used to add an element at the beginning of a vector, while conj is used to add an element at the end of it. How can one memorize this? I found a mnemonic trick over the time that helps me remember this. Here is it:

The trick is to look at the last letter of each function, s and j. As shown in the image below, the s of cons shows the right, while the j of conj shows the left.

This means that cons pushes elements from the left to the right, that is, at the beginning of a vector. conj, on the other hand, pushes elements from the right to the left, which is at the end of a vector. That’s it. Once you see this in your head, you’ll never forget the difference between cons and conj on a vector.