While working on a bug at work, I found out that sort mutates the array & was actually the cause of the bug. MDN actually mentions this here too.

So the trick to avoid any potential bugs is to make a copy of the array & then call sort on the copy of that array & use that for further manipulations.

Lucky for us in Javascript (or ES6), we can make a copy of an array like this:

const copyOfArray = [...sampleArray]