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If you’re looking to move beyond vanilla JavaScript and take your skills to the next level, then you’ve come to the right place. TypeScript is an in-demand language that sits on top of JavaScript. This means you can do everything you can in JavaScript with TypeScript, but also enjoy countless other perks including support for JS libraries, NPM, static typing, and much more.

In this course, you’ll start from the beginning and work your way up to more advanced concepts like type checking, iterators, and manipulating objects and arrays. You'll get a chance to get your hands dirty with plenty of real practice along the way.

For JavaScript developers, TypeScript is a must-know language, not only for today but also for years to come. Don't miss out.

Learn TypeScript: The Complete Course for Beginners

## Asserting untyped code
In JavaScript, you must assert the variables' type since it is not a typed language. While the assertion function is not something you would require using purely TypeScript, it is handy to know in case you have a transpilation error on assertion.

# Asserting untyped code
In JavaScript, you must assert the variables' type since it is not a typed language. While the assertion function is not something you would require using purely TypeScript, it is handy to know in case you have a transpilation error on assertion.

This lesson talks about a new feature of TypeScript 3.7:  the assertion function.

Introduction

The Basics of Variables

Comment

Enum

Generic Type

Functions

Mapped Type

Objects

Index Signature

Variables Advanced

Exception

Alias

Type Checking

Iterators

Manipulating Objects and Array

Sharing Code

Conclusion

Assertion Functions

Asserting untyped code