JS use sort method: What the hell does the example mean? America explain

JavaScript
1

Hiya!

I’m currently doing the JS Algorithms and Data Structures course and loving it. I’m at Functional Programming. There is one chapter on the sort method and I cannot for the life of me figure out what the callback function in this example means/ how it works.

Could someone explain it to me ??

function reverseAlpha(arr) { return arr.sort(function(a, b) { return a === b ? 0 : a < b ? 1 : -1; }); } reverseAlpha(['l', 'h', 'z', 'b', 's']);

This would return the value [‘z’, ‘s’, ‘l’, ‘h’, ‘b’].

How does the callback function sort the letters in the array in descending order? Why are there division signs in there? I am so confused.

2

Hello @chasingthemoon

Welcome to the forum!

Check out theMDN docs on how Array.prototype.sort() works, it has detailed information in it.