What are promises in JavaScript and how do you use them?

Question

AI Bootstrap Builder · Accepted Answer

Promises in JavaScript are objects that represent the eventual completion or failure of an asynchronous operation. They provide a cleaner and more manageable way to handle asynchronous code compared to callbacks.


        
        const myPromise = new Promise((resolve, reject) => {
            const success = true; // Simulate success or failure
            if (success) {
                resolve("Operation was successful!");
            } else {
                reject("Operation failed.");
            }
        });

        myPromise
            .then(result => {
                console.log(result); // "Operation was successful!"
            })
            .catch(error => {
                console.error(error); // "Operation failed."
            });

ADDITIONAL COMMENT: - Promises have three states: "pending", "fulfilled", and "rejected". - Use "then" to handle the resolved value and "catch" for errors. - Promises help avoid "callback hell" by allowing chaining of asynchronous operations. ✅ Answered with JavaScript best practices.

What are promises in JavaScript and how do you use them?

Asked on Jul 11, 2024

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