async/await Examples

async_await.js

// Idea 1: https://medium.com/@bluepnume/learn-about-promises-before-you-start-using-async-await-eb148164a9c8#.s6914ps6a
// Use: https://babeljs.io/repl/ to transpile as ES5

async function asyncDemo() {
  try {
    const res = await getJSON() // Promise.all([getJSON(), getJSON()]) for concurrent requests
    console.log(res.value)
  } catch (err) {
    console.log(err)
  }
  console.log('The following output is displayed afterwards')
}

function getJSON() {
  return new Promise((resolve, reject) => {
    const value = Math.ceil(Math.random() * 5000)

    setTimeout(() => {
      console.log('Random Value: ', value)

      if (value % 2 === 0) {
        resolve({ value })
      } else {
        reject(new Error('An error occurred with the following async request'))
      }
    }, 2000)
  })
}