Learn TypeScript: Type Narrowing

Gain insights into the runtime behavior of the TypeScript code by narrowing down union types.

Continue your TypeScript learning journey with Learn TypeScript: Type Narrowing. Leverage TypeScript’s type system to gain insights into the runtime behavior of your code by narrowing down what types unions may actually be.



### Skills you’ll gain
* Understand how TypeScript utilizes type narrowing at runtime.
* Write type guards to check if a variable is a specific type.
* Check if a property exists in an object using the `in` operator.

### Notes on prerequisites
We recommend that you complete [Learn TypeScript: Union Types](https://www.codecademy.com/learn/learn-typescript-union-types) before starting this course.

• Type Narrowing: Leverage TypeScript’s type system to gain insights into the runtime behavior of your code by narrowing down what union types.
  
• Lesson: Type Narrowing
• Quiz: Type Narrowing
• Project: Park Service Volunteer Appreciation Program
• Informational: Next Steps