ESNext Examples

esnext.js

const c = 'c'

const target = {
  a: true, b: 1
};

const anotherObj = {
  c
};

console.log(Object.assign(target, anotherObj));

const betterObj = {
  ...target,
  c
}

console.log(betterObj)

const arr1 = [1, 2, 3]
const arr2 = [4, 5, 6]

const betterArr = [
  ...arr1, ...arr2
]

console.log(betterArr)

console.log(`${c} u later`)

// ES5
for (var i = 0; i < arr2.length; i++) {
  // console.log(i)
  // console.log(arr2[i])
}

for (var key in betterObj) {
  var propertyName = key
  var value = betterObj[key]
}

// ES6
for (let val of betterArr) {
  console.log(val)
}

// async & await

// Prior to ES7
createNewStripeToken().then(function (stripeResult) {
  paymentCtrl().subscribe(req, res).then(function (paymentResult)) {
    console.log(stripeResult, paymentResult)
  }, function (err) {
    console.error(err)
  })
}, function (err) {
  console.error(err)
})

// ES7
async function () {
  try {
    const stripeResult = await createNewStripeToken()
    const paymentResult = await paymentCtrl().subscribe(req, res)
    console.log(stripeResult, paymentResult)
  }
  catch (err) {
    console.error(err)
  }
}