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

# A parameter with a string literal 

A function can use a _string literal_ as its parameter to know which return type is possible. For example, it’s possible to have a function with a string parameter and have many overloads where a specific string value will cause the execution of one function or another.

In the example below, the method accepts only the strings, `"batman"` and `"superman"`, even if the signature shows a string. See **lines 12** and **13**. TypeScript unites both overloads to create a _string literal_ of all the overloads. 

For example, if you are using an IDE that supports TypeScript, the IDE will show the return type, `Batman` if the parameter is `"batman"`. **Line 14** combines all the overload.

In this lesson, we will approach the string literal with an overload 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

String Literal and Overload Function

A parameter with a string literal