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Learn TypeScript: The Complete Course for Beginners

# What is the mapped type?
The mapped type allows for creating a new type from an existing one. Using the term *map* refers to pointing existing members to a new type by a custom logic that is unique to the mapper implementation. 

A good example is to have an existing interface keep all the same members, but make them *optional* or *read-only*. 

In this lesson, we will set the groundwork for the upcoming lessons on the mapped type.


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

Definition and Usages

What is the mapped type?