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Create Fibonacci numbers generator using JavaScript generators
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Create
promisifyfunction that accepts some async function with callback as last argument and returns a new function, like a taken function, but new function should return a promise;
Function with callback:
function fetchUser(id, callback) {
const users = {
1: {
uid: 1,
name: 'John Doe',
age: 22
}
};
const selectedUser = users[id];
const error = selectedUser ? null : 'No User Found';
setTimeout(function () {
callback(error, selectedUser)
}, 500)
}
Write function promisify that make it possible to do the following:
const promisify = (fn) => {
// your code here
}
const promisifiedFetchUser = promisify(fetchUser);
promisifiedFetchUser(1)
.then(response => console.log(`User data: ${response}`))
.catch(error => console.log(`An error happened: ${error}`))