async-await.js

//  Javascript Nuggets
// async / await
// async must be present, always returns a promise
// await waits till promise is settled
// error handling - try/catch block

// const example = async () => {
//   return 'hello there'
// }

// async function someFunc() {
//   const result = await example()
//   console.log(result)
//   console.log('hello world')
// }

const users = [
    { id: 1, name: 'john' },
    { id: 2, name: 'susan' },
    { id: 3, name: 'anna' },
  ]
  
  const articles = [
    { userId: 1, articles: ['one', 'two', 'three'] },
    { userId: 2, articles: ['four', 'five'] },
    { userId: 3, articles: ['six', 'seven', 'eight', 'nine'] },
  ]
  
  const getData = async () => {
    try {
      const user = await getUser('john')
      const articles = await getArticles(user.id)
      console.log(articles)
    } catch (error) {
      console.log(error)
    }
  }
  getData()
  // getUser('susan')
  //   .then((user) => getArticles(user.id))
  //   .then((articles) => console.log(articles))
  //   .catch((err) => console.log(err))
  
  function getUser(name) {
    return new Promise((resolve, reject) => {
      const user = users.find((user) => user.name === name)
  
      if (user) {
        return resolve(user)
      } else {
        reject(`No such user with name : ${name}`)
      }
    })
  }
  
  function getArticles(userId) {
    return new Promise((resolve, reject) => {
      const userArticles = articles.find((user) => user.userId === userId)
  
      if (userArticles) {
        return resolve(userArticles.articles)
      } else {
        reject(`Wrong ID`)
      }
    })
  }