What is your favourite ES6 feature?

#javascript #discuss #career #interview

Helloooo everyone! 👋 It has been a while since I last posted, I have been rather busy the past 2 weeks!

As the title suggests, I am curious to know what your favourite JavaScript ES6 feature is...🤔

I was recently asked this in an interview and it surprised me as I have been learning JS with latest features so I don't quite know which features are ES6 and which are newer... So I answered with what came to mind, and it was Promises. Since I have been learning about backend development with NodeJS, I have learnt a lot about asynchronous programming which is why I chose that answer (I also talked about async/await, which was not introduced until ES7, oops!). Of course, I had to explain why I chose that particular feature and I talked about the benefit of how it helps eliminate callback hell, improve error handling and how you can use Promise chaining to your advantage.

So, I present to you the same question, what is/are your favourite ES6 feature/s and why? (If you are preparing for an interview, this could be a good practice to answer out loud 😉).

Top comments (16)

Peter Vivo • Jun 30 '22 • Edited

generator function you can get in and leave (yield) so many times, it is perfect for declarative coding time consuming process. Modern usecase is redux-saga

really old poker example on codepen.io

   // example of use generators
   * singleRound(){

    for( let deal of this.dealing() ) yield deal

    for( let flop of this.theBetRound( 'Flop' ) ) yield flop

    for( let flop of this.theFlop() ) yield

    for( let turn of this.theBetRound( 'Turn' ) ) yield turn
    yield this.theTurn(); 

    for( let river of this.theBetRound( 'River' ) ) yield river
    yield this.theRiver(); 

    for( let showdown of this.theBetRound( 'Showdown' ) ) yield showdown

    let winnerIs = []
    for( let score of this.showScores( winnerIs )) yield score
    let winner = this.theShowdown( winnerIs )
    yield winner    
    winner.chips += this.dealer.drawBet()
    for( let pause of Array(10)) yield winner

    // yield this.theShowdown()
  }

Tanwa Sripan • Jun 30 '22

Really cool, thank you for sharing!

timkovik • Jun 29 '22

Optional chaining is amazing

Tanwa Sripan • Jun 30 '22

That's cool also, though I have not used it much

Chris Gustin • Jun 30 '22

I’m a big fan of .forEach() and the related .filter() and .map() methods.

Much cleaner and easier to read than the old C-style iterative loops in my opinion, and a great addition to the language given how much of modern JS and front-end dev involves looping through large amounts of data in some way or another.

Tanwa Sripan • Jun 30 '22

I agree, I also like array methods, they are very handy :D

Tanwa Sripan • Jun 30 '22

That's really cool, I have not used Proxies before, do you have an example use case you have used in the past?

𒎏Wii 🏳️‍⚧️ • Jul 1 '22 • Edited

Here is an example of how I use Proxies in the wild. They're one of my favourite things in JS; the sky is the limit for what you can build using them :D

EDIT: In case that code requires an explanation, here is the documentation.

Tanwa Sripan • Jul 1 '22

Wow! A lot going on here, but it looks awesome :D Not sure I understand it all, but thank you for the example.

admirnisic • Jun 30 '22

Do not know what is my favorite one but one cool feature which is on top of my list is default value for function parameters.

function sayHello(name = 'World') {
    return `Hello ${name}!`;
}

Randall • Jun 30 '22

There are a lot of great features that came in ES6, but I would agree that Promises are my favorite, especially since they paved the way for async/await. Const, let, and classes are also great.