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Reject a Promise in JavaScript – onlinecode

Reject a Promise in JavaScript

Reject a Promise in JavaScript

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The Promise.reject() function is the most concise way to
create a rejected promise that contains a given error. You
should then use .catch() to handle the error.

const p = Promise.reject(new Error('Oops!'));

return p.catch(err => {
  err.message; // 'Oops!'
});

With the Promise Constructor

When you create a promise using new, you call the Promise constructor.
The Promise constructor takes a single parameter, an executor function.
The Promise constructor then executes the executor function with 2
arguments: resolve() and reject().

function executor(resolve, reject) {
  typeof resolve; // 'function'
  typeof reject; // 'function'
}

new Promise(executor);

To reject a promise from the executor function, you should just call
reject() with an error object.

const p = new Promise((resolve, reject) => {
  reject(new Error('Oops!'));
});

return p.catch(err => {
  err.message; // 'Oops!'
});

Reject With Non-Error

You can reject a promise with any value, not just an error object.

const p = Promise.reject(42);

return p.catch(err => {
  err; // 42
});

However, many libraries and frameworks assume that promises are always
rejected with an error. So you should be careful if you choose to
call Promise.reject() with a value that isn’t an error.



JavaScript Fundamentals to Reject a Promise in JavaScript

JavaScript is a programming language that is used to create interactive web pages. It is a client-side scripting language, which means that it runs on the user’s browser. JavaScript can be used to add animation, interactivity, and functionality to web pages.

Here are some of the fundamentals of JavaScript:

These are just some of the fundamentals of JavaScript. There are many other concepts that you can learn as you continue to develop your skills.

Here are some resources that you can use to learn more about JavaScript:

I hope this helps for Reject a Promise in JavaScript!

Here are some additional tips for learning JavaScript:

With a little practice, you’ll be able to learn JavaScript and start building amazing web applications.

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