Best of Modern JavaScript — Resolve and Reject Promises

Since 2015, JavaScript has improved immensely.

It’s much more pleasant to use it now than ever.

In this article, we’ll look at JavaScript promises.

Other Ways of Creating Promises

Other than using the Promise constructor, we can create promises in other ways.

One way is the Promise.resolve method.

It takes the resolved value of the promise as its argument.

And it returns a promise.

For instance, we can write:

Promise.resolve(1)
  .then(x => console.log(x));

x is the resolved value from Promise.resolve .

If x is a promise whose construction is the receiver, then the promise is unchanged.

For instance, if we have:

const p = new Promise(() => null);
console.log(Promise.resolve(p) === p);

then we get true from the console log.

If the argument is a thenable and then the then method in the argument is a function, then the resolved value with Promise.resolve is the argument that we call the then parameter with.

For example, if we have:

const thenableObj = {
  then(reaction) {
    reaction('foo');
  }
};
const promise = Promise.resolve(thenableObj);
console.log(promise instanceof Promise); 
promise.then(x => console.log(x));

We have a thenableObj , which has the then method.

It takes a reaction function and we called it with 'foo' .

Then we pass in an object to the Promise.resolve method, which returns a promise.

If we check if promise is an instance of a Promise , then that returns true .

We can also call then on it with a callback to get the 'foo' value, which is assigned to x .

#javascript #technology #programming

What is GEEK

Buddha Community

Procedure To Become An Air Hostess/Cabin Crew

Minimum educational required – 10+2 passed in any stream from a recognized board.

The age limit is 18 to 25 years. It may differ from one airline to another!

 

Physical and Medical standards –

• Females must be 157 cm in height and males must be 170 cm in height (for males). This parameter may vary from one airline toward the next.
• The candidate's body weight should be proportional to his or her height.
• Candidates with blemish-free skin will have an advantage.
• Physical fitness is required of the candidate.
• Eyesight requirements: a minimum of 6/9 vision is required. Many airlines allow applicants to fix their vision to 20/20!
• There should be no history of mental disease in the candidate's past.
• The candidate should not have a significant cardiovascular condition.

You can become an air hostess if you meet certain criteria, such as a minimum educational level, an age limit, language ability, and physical characteristics.

As can be seen from the preceding information, a 10+2 pass is the minimal educational need for becoming an air hostess in India. So, if you have a 10+2 certificate from a recognized board, you are qualified to apply for an interview for air hostess positions!

You can still apply for this job if you have a higher qualification (such as a Bachelor's or Master's Degree).

So That I may recommend, joining Special Personality development courses, a learning gallery that offers aviation industry courses by AEROFLY INTERNATIONAL AVIATION ACADEMY in CHANDIGARH. They provide extra sessions included in the course and conduct the entire course in 6 months covering all topics at an affordable pricing structure. They pay particular attention to each and every aspirant and prepare them according to airline criteria. So be a part of it and give your aspirations So be a part of it and give your aspirations wings.

Read More:   Safety and Emergency Procedures of Aviation || Operations of Travel and Hospitality Management || Intellectual Language and Interview Training || Premiere Coaching For Retail and Mass Communication || Introductory Cosmetology and Tress Styling  ||  Aircraft Ground Personnel Competent Course

For more information:

Visit us at:     https://aerofly.co.in

Phone         :     wa.me//+919988887551 

Address:     Aerofly International Aviation Academy, SCO 68, 4th Floor, Sector 17-D,                            Chandigarh, Pin 160017 

Email:     info@aerofly.co.in

 

#air hostess institute in Delhi, 

#air hostess institute in Chandigarh, 

#air hostess institute near me,

#best air hostess institute in India,
#air hostess institute,

#best air hostess institute in Delhi, 

#air hostess institute in India, 

#best air hostess institute in India,

#air hostess training institute fees, 

#top 10 air hostess training institute in India, 

#government air hostess training institute in India, 

#best air hostess training institute in the world,

#air hostess training institute fees, 

#cabin crew course fees, 

#cabin crew course duration and fees, 

#best cabin crew training institute in Delhi, 

#cabin crew courses after 12th,

#best cabin crew training institute in Delhi, 

#cabin crew training institute in Delhi, 

#cabin crew training institute in India,

#cabin crew training institute near me,

#best cabin crew training institute in India,

#best cabin crew training institute in Delhi, 

#best cabin crew training institute in the world, 

#government cabin crew training institute

JavaScript Promise: Methods Comparison

Introduction

Promises in JavaScript are used to handle asynchronous operations by keeping track of whether a certain event has happened. If that certain event has taken place, it determines what happens next. Promises return a value which is either a resolved value or a reason why it’s rejected. They can handle multiple asynchronous operations easily and they provide better error handling than callbacks and events.

Callback: A callback is a function that is passed into another function as an argument to be executed later.

Events: Events provide a dynamic interface to a WebPage and are connected to elements in the Document Object Model(DOM), for example: onclick(), onmouseover() etc.

A Promise has four states

Pending: Before the event has happened, the promise is in the pending state.

Settled: Once the event has happened it is then in the settled state.

Fulfilled: Action related to the promise has succeeded.

Rejected: Action related to the promise has failed.

#javascript #javascript-development #javascript-tutorial #promises #javascript-tips

Javascript Promise Reject | Promise.reject() in Javascript

Javascript Promise reject() is an inbuilt function that returns the Promise object that is rejected with a given reason. The static Promise.reject() function returns the Promise that is rejected. For debugging purposes and selective error catching, it is useful to make reason an instanceof Error.

Javascript Promise Reject Example

The syntax for Javascript Promise.reject() method is following.

Promise.reject(reason);

The parameter reason is why this promise rejected.

Let us take a simple example.

// app.js

const p1 = new Promise((resolve, reject) => { // eslint-disable-line no-unused-vars
    setTimeout(() => {
        reject('fail promise');
    }, 1000);
});

p1.catch(error => { 
    console.log(error);
});

Here, we are rejecting the promise, and then we call the catch method on that promise to catch the error and log that error in the console.

#javascript #promise.reject #instanceof

Hire Dedicated JavaScript Developers -Hire JavaScript Developers

It is said that a digital resource a business has must be interactive in nature, so the website or the business app should be interactive. How do you make the app interactive? With the use of JavaScript.

Does your business need an interactive website or app?

Hire Dedicated JavaScript Developer from WebClues Infotech as the developer we offer is highly skilled and expert in what they do. Our developers are collaborative in nature and work with complete transparency with the customers.

The technology used to develop the overall app by the developers from WebClues Infotech is at par with the latest available technology.

Get your business app with JavaScript

For more inquiry click here https://bit.ly/31eZyDZ

Book Free Interview: https://bit.ly/3dDShFg

#hire dedicated javascript developers #hire javascript developers #top javascript developers for hire #hire javascript developer #hire a freelancer for javascript developer #hire the best javascript developers

Promise.allSettled() vs Promise.all()

Promise.allSetlled() is recently introduced in ECMA 2020.
Check out how it is different from Promise.all()

https://www.geekstutorialpoint.com/2020/05/promiseallsettled-vs-promiseall.html

#javascript #promise.all #promise.allsettled #ecma #promise #jquery