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

# Generic and `typeof`
The generic code does not allow the use of `typeof` on T, type `new T`, or `instanceof T`. 

The reason is that the transpilation step removes all traces of type. TypeScript transpiles `typeof` and `instanceof` operations into JavaScript, and during that step, it erases types. The absence of type at runtime justifies the lack of generic type verification at runtime as well. 

# The *Generic* solution
To compare two generics, we need to keep in mind that the types are erased (removed) when TypeScript is transpiled to JavaScript. Thus, we need to create a custom generic array with a unique identifier (or many) for comparison. For example, we can add an `id` field and have that value, not erased at runtime, be compared. 

This lesson explains the difference between comparing two generic types and two primitive types.

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

Generic Comparison

Generic and `typeof`

Generic Comparison

Generic and typeof

Generic and `typeof`