How to simplify JS code?

Question

JavaScript

I study JS in practice of creating a combat system for the game. Already at the start of the combat, I encountered code duplication. So far everything is working quickly, but there will be problems further. I guess that all the checks through which I interact with the player can be put into arrays and get the desired press through cycles, but I still don’t understand how this is done. According to the game that I draw: at the bottom there are 5 heroes in a row, in the upper left corner there is a pet that throws magical amplifications, by clicking on the pet, magic opens, activate any magic and click on the hero. The hero will have the selected power-up.
https://codepen.io/Electromax/pen/QWaqbRe

Answer 1

Variables can be written

let a
let b
let c

and let a, b, cinstead of if use switch case. This will greatly shorten your code.