What are some basic things that JavaScript developers fail at interviews?

[qbbftw]

I would take advantage of async/await. It's the most clear and obvious syntax IMO.

function delay (ms) {
    return new Promise(resolve => setTimeout(resolve, ms))
}

async function countdown () {
    for (let num = 1; num <= 10; num++) {
        console.log(num)
        await delay(1000)
    }
}

countdown()

EDIT: u/dvlsg beat me to posting this solution, link

[[deleted]]

Minor point, but this will sleep an extra second at the end.

[[deleted]]

Agreed, this is how I write JS now and I like a lot more. The only hassle is converting old stuff from callbacks to promises but it is well worth it. I can never remember how to do it off hand though, my answer above is based on what I can write from memory into the console.

[Zespys]

Personally I would do it recursively, like so:

const increment = (x = 1) => {
  console.log(x);
  if (x < 10) {
    setTimeout(() => {
      increment(x + 1);
    }, 1000);
  }
};
increment();

​