Array.prototype.at

Working with arrays is an important ability in any programming language, particularly JavaScript, as we proceed to depend on exterior knowledge APIs. JavaScript has added strategies like discover and `findIndex just lately, however one syntax I really like from languages like Python is retrieving values by damaging indexes.

Once you wish 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 might use pop however that modifies the array. As an alternative you need to use at and an index, even a damaging 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 identified perform however helpful, if just for the shorthand syntax!