thejohnfreeman

async function getFullName(username, password) {
  let token
  try {
    token = await logIn(username, password);
  } catch (error) {
    console.error('wrong username or password')
    return
  }
  const user = await getUser(token)
  return user.fullName

thejohnfreeman

const getFullName = async(function* (username, password) {
  let token
  try {
    token = yield logIn(username, password);
  } catch (error) {
    console.error('wrong username or password')
    return
  }
  const user = yield getUser(token)
  return user.fullName

thejohnfreeman

FROM alpine:latest
COPY boost.patch /tmp
COPY prepare.sh /tmp
WORKDIR /tmp
RUN ./prepare.sh

thejohnfreeman

function* g() {
  try {
    yield 1 // throws 'first error'
  } catch (error) { // catches 'first error'
    console.error('inside generator', error)
  }
  yield 2 // throws but does not catch 'second error'
  return 3 // never reached because exception thrown
}

thejohnfreeman

const generator = g()
generator.next() // { value: 1, done: false }
generator.next() // { value: 2, done: false }
generator.next() // { value: 3, done: false }
generator.next(10) // { value: 11, done: true }

thejohnfreeman

function* g() {
  yield 1
  yield 2
  return (yield 3) + 1
}

thejohnfreeman

step1()
  .then(result1 => step2(result1))
  .then(result2 => step3(result2))
  .then(result3 => step4(result3))
  .then(result4 => console.log(result4))
  .catch(error => throw error)

thejohnfreeman

async(function* () {
  const result1 = yield step1()
  const result2 = yield step2(result1)
  const result3 = yield step3(result2)
  const result4 = yield step4(result3)
  console.log(result4)
  // Errors are implicitly thrown.
})()

thejohnfreeman

step1(function (error, result1) {
  if (error) throw error
  step2(result1, function (error, result2) {
    if (error) throw error
    step3(result2, function (error, result3) {
      if (error) throw error
      step4(result3, function (error, result4) {
        if (error) throw error
        console.log(result4)
      })

thejohnfreeman

async function () {
  const result1 = await step1()
  const result2 = await step2(result1)
  const result3 = await step3(result2)
  const result4 = await step4(result3)
  console.log(result4)
}()