TypeScript : Understanding void and unknown

TypeScript offers several types to ensure your code is safe and predictable. Among them, void and unknown are two unique types that serve specific purposes. This post will help you understand these types, their use cases, and how to implement them with examples.

Q1: What is the void Type?

The void type represents the absence of a value. It is most commonly used as the return type for functions that don’t return anything. If a function performs a side effect (e.g., logging something or modifying data) but doesn't produce a result, its return type should be void.

Key Points About void:

• void indicates that the function does not return a value.
• Attempting to assign a void function to a variable will result in a undefined value, as undefined is the actual return value in JavaScript.

Example: Function with void Type:

function logMessage(message: string): void {
  console.log(`Log: ${message}`);
}

logMessage("Hello, TypeScript!"); // Output: Log: Hello, TypeScript!

Explanation:

• The logMessage function doesn’t return anything. Its purpose is to log a message, so the return type is void.
• If you attempt to use the return value of this function (e.g…