This file contains 3 types of implementations for a user authentication system using JavaScript Promises:
- Type 1: Check username and password together
- Type 2: Separate username and password verification
- Type 3: Add a new user and set password asynchronously
It demonstrates asynchronous behavior using setTimeout and Promise chaining.
- Type 1: Basic username/password check
- Type 2: Shows sequential async checks for username and password
- Type 3: Demonstrates adding a new user and setting a password asynchronously