Convert SetInterval To Promise

20 May 2020 - 1 answer

Hello I'm new to javascript and wondering if there is a way to covnert below setInterval thingy into a promise so that .then could be used instead of the callback. Any help?

My ideas:
With a setTimeout I could resolve after a fixed time. But I'm not getting any ideas dealing with setInterval...

function alert_above(scrip, price, callback) {
  var intvl = setInterval(() => {
    if (get_last_price(scrip) > price) {
      callback();
      clearInterval(intvl);
    }
  }, 1000);
 return intvl;
}

Answer

I think you could wrap into a new Promise like :

function promisifySetInterval(time) {
  var defer = new Promise(resolve => {
    let counter = 0
    var intvl = setInterval(() => {
      if (counter > time) {
        resolve('hey');
        clearInterval(intvl);
      } else {
        counter += 1000
      }
    }, 1000);
  })
 return defer;
}

promisifySetInterval(2000).then(param => {
  console.log('hey', param)
})

And for youre case something like this :

function alert_above(scrip, price) {
  var defer = new Promise(resolve => {
    var intvl = setInterval(() => {
      if (get_last_price(scrip) > price) {
        resolve('hey');
        clearInterval(intvl);
      }
    }, 1000);
  })
 return defer;
}

alert_above().then(param => {
  console.log('hey', param)
})

source: stackoverflow.com

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Convert SetInterval To Promise

20 May 2020 - 1 answer

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