Creating Custom Promises

When you create a custom Promise like checkNumber, you can control how and when it resolves or rejects. The function above returns a new Promise that checks if a given number is greater than 10. If the condition is met, it calls resolve with a success message; otherwise, it calls reject with an error message. To handle the outcome of this Promise, you use the .then method to respond to a successful resolution, and the .catch method to handle a rejection. For instance, calling checkNumber(15) would trigger the .then block, while checkNumber(5) would trigger the .catch block. This pattern helps you manage asynchronous results and errors in a clean and predictable way.