JavaScript: Why doesn't getting the last element of an array work?

Question

JavaScript

Hello!
Why doesn't getting the last element of an array work? Is this the shortest entry?

document.querySelectorAll('head > link[rel="stylesheet"]')[this.length-1];

Thank you!

Answer 1

What do you expect from this.length-1? Depending on the context of the call, you can have anything in this. If there is window, (window.length-1) == -1, and there cannot be an element with index -1 in the array.

let stylesheets = document.querySelectorAll('head > link[rel="stylesheet"]')
let last = Array.from(stylesheets).pop()
// или
let last = [...stylesheets].pop()