JavaScript: Promisification

Last update: 19 Jan 23:20
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promisify.js

Implement and export as default a function that "promisifies" asynchronous functions with callbacks.

import promisify from '../promisify.js';

const readFile = promisify(fs.readFile);
const writeFile = promisify(fs.writeFile);

const filepath = '/tmp/myfile';

writeFile(filepath, 'content')
  .then(() => readFile(filepath))
  .then(console.log);

When implementing asynchronous functions, remember that the callback is always passed by the last parameter. ​

Tips

  • Use rest and spread operatores

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