TypeScript Functions

What are Functions?

A function is a block of code that runs when called.

In TypeScript, functions can include types for parameters and return values.

Basic Function

Parameter Types

You can define types for function parameters.

Return Types

Functions can specify the type of value they return.

Arrow Functions

Arrow functions support type annotations.

Optional Parameters

Use ? to make parameters optional.

Default Parameters

Function Types

You can define types for entire functions.

Full Example

Why Functions are Important

• Reuse code
• Enforce type safety
• Improve readability
• Reduce bugs

Common Mistakes

• Forgetting return types
• Using incorrect parameter types
• Confusing optional and default parameters

Practice

Create a function that takes two numbers and returns their product.

Need Help?

Ask the AI if you need help understanding or want to dive deeper in any topic