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

## Restricting the signature of a constructor
In some scenarios, someone may need to instantiate a generic object from a function. 
```
const obj = funct(TypeIWantToInstantiate, parameter1, parameterx);
```
The goal is to have a *type constraint* on the construction of an object type. 

It is possible to use the *constructed signature* in a **construction function** to dynamically create a new instance of a specific type that requires an **exact** constructor signature. 

> A construction function is a function that returns a *new* object. 

>A constructor signature is the type and number of the parameters.

For example, a function taking `T` as a generic argument can require an argument of type `{new(): T; }` and returns `T`. An interface with a member of `new` indicates that the class must have a constructor with the defined parameter. In the following code, **line 2** constrains any type passed to have a constructor with a single parameter of type `string`.

# Restricting the signature of a constructor
In some scenarios, someone may need to instantiate a generic object from a function. 
```
const obj = funct(TypeIWantToInstantiate, parameter1, parameterx);
```
The goal is to have a *type constraint* on the construction of an object type. 

It is possible to use the *constructed signature* in a **construction function** to dynamically create a new instance of a specific type that requires an **exact** constructor signature. 

> A construction function is a function that returns a *new* object. 

>A constructor signature is the type and number of the parameters.

For example, a function taking `T` as a generic argument can require an argument of type `{new(): T; }` and returns `T`. An interface with a member of `new` indicates that the class must have a constructor with the defined parameter. In the following code, **line 2** constrains any type passed to have a constructor with a single parameter of type `string`.

This lesson explains how to apply the generic type to a construction 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

Generic with Construction Functions

Restricting the signature of a constructor