What does the .then() method do in a promise?
Understand the Problem
The question is asking about the behavior and functionality of the .then() method in JavaScript promises, specifically what condition triggers its execution.
Answer
The .then() method handles promise results and allows chaining by returning a new promise.
The .then() method in a promise is used to handle successful outcomes of asynchronous operations and allows for method chaining by returning a new promise. It can take two callback functions: one for when the promise is fulfilled and one for when it is rejected.
Answer for screen readers
The .then() method in a promise is used to handle successful outcomes of asynchronous operations and allows for method chaining by returning a new promise. It can take two callback functions: one for when the promise is fulfilled and one for when it is rejected.
More Information
The .then() method is a crucial part of promise-based asynchronous operations in JavaScript, enabling developers to write clearer, more linear-looking asynchronous code.
Tips
A common mistake is misunderstanding that a new promise is always returned, which can cause issues if not properly handled.
Sources
- JavaScript Promise then() Method - GeeksforGeeks - geeksforgeeks.org
- JavaScript Promise then() Method - W3Schools - w3schools.com
- Using promises - JavaScript - MDN Web Docs - developer.mozilla.org
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