Here's a query for you. Can I do the following:
class MyClass {
async constructor(){
return new Promise()
}
}
Here's a query for you. Can I do the following:
class MyClass {
async constructor(){
return new Promise()
}
}
Building upon the insights of Patrick Roberts, it is important to note that while you may not be able to directly achieve what you are requesting, a workaround solution can look something like this:
class MyClass {
constructor() {
// Include static initialization logic here
}
async initialize() {
await WhatEverYouWant();
}
static async create() {
const o = new MyClass();
await o.initialize();
return o;
}
}
To implement the above solution in your code, instantiate your object as follows:
const obj = await MyClass.create();
Instead of trying to predict future decisions, let's focus on what we already know and the practical aspects.
Similar to ES6, ES7 aims to expand the language in a backwards compatible way. Essentially, a backwards compatible constructor function is just like a regular function (with some restrictions at runtime) that should be called with the new keyword. In this scenario, non-object return values are ignored and the newly allocated object is returned, while object return values are simply returned as they are (and the new object is discarded). Therefore, running your code would result in the promise being returned without actual "object construction." It doesn't seem very practical, and anyone who tries to make use of such code will likely face rejection.
To sum it up:
async constructor may present conflicting ideas.To retrieve a promise from the returned value, use the following code:
class User {
constructor() {
this.promise = this._initialize()
}
async _initialize() {
const response = await fetch('https://jsonplaceholder.typicode.com/users')
const users = await response.json()
this.user = users[Math.floor(Math.random() * users.length)]
}
}
(async () => {
const user = new User()
await user.promise
return user
})().then(u => {
$('#result').text(JSON.stringify(u.user, null, 2))
}).catch(err => {
console.error(err)
})<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
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