Let's Learn Vocabularies

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Frequently Asked Questions

Arrow Functions (=>)
Arrow functions are a simpler way to write functions in JavaScript, introduced in ES6.
✅ Basic Syntax:


                        // Regular function
                        function add(a, b) {
                          return a + b;
                        }
                        
                        // Arrow function
                        const add = (a, b) => a + b;

✅ Features:

Shorter syntax.
They don’t have their own this, arguments, super, or new.target.
Useful for callback functions, array methods, etc.

JavaScript Promises provide a way to handle asynchronous operations by representing a value that may be available now, in the future, or never. Here’s an overview of how they work:
1. Promise States
A Promise has three states:
1. Pending: The initial state, meaning the operation is still in progress.
2. Fulfilled: Indicates that the operation completed successfully, and the promise now holds a value.
3. Rejected: Means the operation failed, and the promise holds a reason (typically an error) for the failure.

2. Creating a Promise
You can create a promise using the Promise constructor:

                        
                            const myPromise = new Promise((resolve, reject) => {
                                // Do some asynchronous work...
                                if (/* operation successful */) {
                                  resolve('Success!');
                                } else {
                                  reject('Error occurred');
                                }
                              });

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