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

# Setting `enum` as `const` to increase speed
`enum` can be set as a constant to speed up the performance. This way, during execution, instead of referencing the function generated by TypeScript to JavaScript, it will use the value. 

For example, without constant `enum`, the value set to a direction with `Orientation.East` will be equal to a function that looks for the value in the map to get the value. However, with a constant, the value is set in the transpiled code to `0` directly – no more function or mapping. 

# Drawbacks 

There are not a lot of drawbacks to this. You can still use the `enum` with the dot notation and the name of one of the entries. You can also use the name of the `enum` with the square brackets and the name of one of the entries. 

However, you won’t be able to use the square brackets with the value. 

The only difference is that a constant `enum` doesn’t allow for redefining values once they’re initialized, which is allowed with default non-constant `enum`. However, in both cases, it’s possible to add an entry using the square brackets. 

In this lesson, you will see how it is possible to improve the performance of enum.

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

Speeding Up Enum

Setting `enum` as `const` to increase speed

Speeding Up Enum

Setting enum as const to increase speed

Setting `enum` as `const` to increase speed