obar-zik / whats-new

A place to find new staff in the javascript world

WHATS NEW

this repo is for better understanding the new features in node and npm

Features In node 16.x

Object.hasOwn An Easier Way To Check Objects Properties (16.9.0)

The Object.hasOwn function is a static alias for Object.prototype.hasOwnProperty.call

Error Can Now Tell You What cause it (16.9.0)

When You create a new error you can now add the cause option to tell that error cause it to fire, like so

const firstError = new Error("ERROR!!!!!");

const secondError = new Error("ANOTHER ERROR!!!!", { cause: firstError });

This can be very helpful when you have an error that caches the error log them and them throw the error again.

function alwaysFails() {
  throw new Error("😱");
}

function ErrorHandler() {
  try {
    alwaysFails();
  } catch (err) {
    console.error("JACK! ITS HAPPENED AGAIN!");
    throw new Error("You handel it", { cause: err });
  }
}

The New Array.prototype.at Function (16.6.0)

you can now use the newly at function.

this function allow you to select an object in an array.

the big advantage of using at instead if just selecting the with the normal bracket [] is that the at function can select items from the end!

example

const arr = [1, 2, 3, 4, 5];

const firstItem = arr.at(0);
const lastItem = arr.at(-1);

console.log(`First Item: ${firstItem}`); // prints 1
console.log(`Last Item: ${lastItem}`); // prints 5

Timers Are Now Available As A Promise (16.0.0)

You can now require timers/promise and get this timers as promise 😄

• setTimeout
• setImmediate
• setInterval

const { setTimeout } = require("timers/promise");

async function computerStartup() {
  console.log("Doing important Stuff!");

  const message = await setTimeout(1000, "Done!");

  console.log(message); // prints "Done!"
}

Node Is now Available For Apple silicon (16.0.0)

You can now Download from nodejs's site a compatible version with apple silicon