šŸ“• LangChain for JavaScript developers is now out!
Build 5 Next.js apps with ChatGPT integrated features using LangChain.

What is an executor function for a Javascript promise?

We can pass an executor function to the constructor of a Javascript native promise. It takes two parameters: the resolve and rejects callouts of that promise:

new Promise( 
    () => {...} 
).then ( ... );

Based on our needs we can customize the behavior of that Promise using the exector.

For example, we can have for this executor function to automatically trigger the resolve or the rejects if our promise does not get an answer after some amount of time.

const executor = (resolve, reject) => {
    setTimeout(
        () => reject("Did not get an anwser after 1 sec")
    , 1000);
};

// this promise will automatically be rejected after 1 sec
new Promise(executor).then(result => {
    console.log(result);
});

More details about it here.

šŸ“– 50 Javascript, React and NextJs Projects

Learn by doing with this FREE ebook! Not sure what to build? Dive in with 50 projects with project briefs and wireframes! Choose from 8 project categories and get started right away.

šŸ“– 50 Javascript, React and NextJs Projects

Learn by doing with this FREE ebook! Not sure what to build? Dive in with 50 projects with project briefs and wireframes! Choose from 8 project categories and get started right away.


Leave a Reply

Your email address will not be published. Required fields are marked *