Array.prototype.at

Working with arrays is a vital talent in any programming language, particularly JavaScript, as we proceed to depend on exterior information APIs. JavaScript has added strategies like discover and `findIndex lately, however one syntax I like from languages like Python is retrieving values by unfavourable indexes.

While you need to get the worth of the final merchandise in an array, you find yourself with an archaic expression:

const arr = ["zero", "one", "two", "three"];
const final = arr[arr.length - 1];

You would use pop however that modifies the array. As a substitute you should utilize at and an index, even a unfavourable index, to retrieve values:

const arr = ["zero", "one", "two", "three"];
arr.at(-1); // "three"
arr.at(-2); // "two"
arr.at(0); // "zero"

at is a little or no recognized perform however helpful, if just for the shorthand syntax!