TypeScript for Beginners - Overloading

The video tutorial explains how to create a 'double me' method in TypeScript that can handle both numeric and string data types. The method doubles numbers by multiplying them by two and duplicates strings by appending them to themselves. The tutorial covers implementing the method, using TypeScript's type-checking features to restrict input types, and testing the function with different data types. It also highlights the benefits of TypeScript over JavaScript in terms of type safety and function overloading.

Explain the significance of checking if 'X' has a value before performing operations on it.

What error occurs when trying to pass an array to the 'double me' function?