Gain insights into TypeScript's core concepts, from basics to advanced type checking and iterators. Learn about static typing and JS library support through practical, hands-on experience.

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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

# User-defined function
A custom user-defined type guard is a function that checks specific parts of the structure of an object to determine if it is one type or another. The advantage is that the type does not need to be altered with a branded property or used with a discriminator. However, it comes with the cost of foregoing functions that check every type. 

The following code has a function on **line 21** which takes a single parameter of type `any`. The function checks for two members and because `any` is used, it can be anything. When the function returns `true`, the function will help TypeScript to narrow the type to the one defined after `is`. On **line 21**, the function narrows to `Person`.

This lesson shows a way to type check by manually building an algorithm that aims to find unique characteristics in the structure.

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

Type Checking an Interface with Custom User-Defined Type Guard

User-defined function