What is the best way to implement an onReady promise in a JavaScript application?

Question

What is the best way to implement an onReady promise in a JavaScript application?

Exploring some Advanced topics in JS I am currently diving into and there is an interesting concept that's piqued my curiosity.

I've been developing a VueJS application and now I'm looking to expose certain data and even methods from Vue outside of the Vue framework itself, leveraging vuex along the way.

The goal here is to allow users to utilize standard JavaScript on the front end to enhance the functionality of the application.

The vision is for users to incorporate something like this in their front-end code. I have come across various JS frameworks/apps that adopt a similar approach.

MyApp.onReady.then(function(instance) {
    // utilize the instance object
    var email = instance.data["email"]
    var name = instance.data["name"]
    var isComplete = member.isComplete
})

Now, what I'm striving to comprehend is the implementation required in my App to bring the above scenario to life.

Based on the code provided, it seems there is a Class MyApp that is instantiated with new MyApp({}), featuring a promise being resolved, yet the actual steps to achieve this remain uncertain to me.

javascript vue.js vuejs2 javascript-objects vuex

Answer 1

Answer №1

Below is an example demonstrating how to return a promise.

const Application = {
  onLaunch() {
    return new Promise( (resolve, reject) => {
      // Perform your tasks here and then call resolve().
      // Example below
      setTimeout(()=>{resolve()}, 1000)
    })
  }
}

To use it, make sure to call onLaunch(), not just onLaunch.

Application.onLaunch().then(()=>{
  // Add your code here.
})

Answer 2

Below is an example demonstrating how to return a promise.

const Application = {
  onLaunch() {
    return new Promise( (resolve, reject) => {
      // Perform your tasks here and then call resolve().
      // Example below
      setTimeout(()=>{resolve()}, 1000)
    })
  }
}

To use it, make sure to call onLaunch(), not just onLaunch.

Application.onLaunch().then(()=>{
  // Add your code here.
})

Answer 3

Answer №2

Here is a method to achieve the desired outcome:

class NewApp {
  constructor(data = {
    email: null,
    name: null
  }) {
    this.data = data;
  }

  get ready() {
    return new Promise((resolve, reject) => {
      resolve(this);
    });
  }
}

const onReadyFunction = instance => {
  const {
    email,
    name
  } = instance.data;

  console.log(`${name}'s contact email is: ${email}.`);
};


const john = {
  email: '<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="780c1715381e19131d15191114561b1715">[email protected]</a>',
  name: 'John'
};

const application = new NewApp(john);

application.ready.then(onReadyFunction);

Answer 4

Here is a method to achieve the desired outcome:

class NewApp {
  constructor(data = {
    email: null,
    name: null
  }) {
    this.data = data;
  }

  get ready() {
    return new Promise((resolve, reject) => {
      resolve(this);
    });
  }
}

const onReadyFunction = instance => {
  const {
    email,
    name
  } = instance.data;

  console.log(`${name}'s contact email is: ${email}.`);
};


const john = {
  email: '<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="780c1715381e19131d15191114561b1715">[email protected]</a>',
  name: 'John'
};

const application = new NewApp(john);

application.ready.then(onReadyFunction);

Answer 5

Answer №3

By adding the async keyword to a method, it automatically returns a promise.

const AppName = {
  async onReady() {
      // Perform tasks here and then return to resolve.
      // Raising an exception will trigger a rejection.
  }
}

How to use:

AppName.onReady().then(()=>{
  // Application is ready
})

If your code is within an async function, you can simply use await.

Usage:

// Must be inside an async function
await AppName.onReady()
// Application is ready

To use await at the root level, wrap it in an immediately invoked function:

(async()=>{
   await AppName.onReady()
})()

Answer 6

By adding the async keyword to a method, it automatically returns a promise.

const AppName = {
  async onReady() {
      // Perform tasks here and then return to resolve.
      // Raising an exception will trigger a rejection.
  }
}

How to use:

AppName.onReady().then(()=>{
  // Application is ready
})

If your code is within an async function, you can simply use await.

Usage:

// Must be inside an async function
await AppName.onReady()
// Application is ready

To use await at the root level, wrap it in an immediately invoked function:

(async()=>{
   await AppName.onReady()
})()

What is the best way to implement an onReady promise in a JavaScript application?

Answer №1

Answer №2

Answer №3

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