https://github.com/idindrakusuma/learning-async-await-node

https://github.com/idindrakusuma/learning-async-await-node

Last synced: 6 days ago
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• Host: GitHub
• URL: https://github.com/idindrakusuma/learning-async-await-node
• Owner: idindrakusuma
• Created: 2018-08-10T15:03:08.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2018-08-11T03:50:54.000Z (over 6 years ago)
• Last Synced: 2024-12-22T17:15:55.945Z (12 days ago)
• Language: JavaScript
• Size: 1000 Bytes
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: readme.md

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README

        
# rangkuman belajar async await

`Async await` merupakan syntax baru pada javascipt. Syntax ini diperkenalkan di ES6. untuk menjalankanyapun tidak semua versi NodeJS bisa. Minimal harus versi `NodeJS > 7`.

`async await` berfungsi sebagai alternatif dari penggunaan promise yang codenya lumayan panjang. pakai async await jadi lebih simple. contoh pemanggilan fungsi async await

```javascript

  /* get status using normal promise */

  const getStatus = (userId) => {

      let user;

      return getUser(userId)

        .then(tempUser => {

            user = tempUser;

            return getGrades(user.schoolId)

        })

        .then(grades => {

            let average = 0;

            if(grades.length > 0) {

                average = grades.map(grade => grade.grade).reduce((a, b) => a + b) / grades.length;

            }

            return `${user.name} has a ${average}% in the class.`

        })

  }

```

```javascript

/* using async await */

const getStatusAsync = async (userId) => {

      const user = await getUser(userId);

      const grades = await getGrades(user.schoolId);

      

      let average = 0;

      if(grades.length > 0) {

          average = grades.map((grade) => grade.grade).reduce((a, b) => a + b) / grades.length;

      }

      

      return `${user.name} has a ${average}% in the class.`

  }

```