ORM-libraries-for-NodeJS-Typescript-and-SQL.png

ORM.tar.gz

node-server

typeorm-setup

docker-prisma

basic-api

basic-express

typeorm-crud

typeorm-SQL

typeorm-associations

Object Relational Mappers (ORM) are becoming popular in building modern backend applications as they help maintain a consistent codebase, improve security, and provide ease in working with different databases. Also, TypeScript has almost become a must-use language for building JavaScript applications.

In this course, you’ll start by getting familiar with Node.js and Express. You’ll then go over the main features of TypeScript and its advantages over JavaScript. Next, you’ll learn how to do a Docker setup of PostgreSQL. Moreover, this will be followed by introductions to two of the most popular TypeScript ORMs for Node.js: Prisma and TypeORM. Along the way, you’ll practice your skills by building two projects. In the end, you’ll explore some advanced features of these ORMs.

This course will equip you with the skills, knowledge, and hands-on experience to work with SQL databases and Node.js using TypeScript ORMs.

Getting Started with TypeScript ORM Libraries for Node.js

**(Select all that apply.)** Which of these commands is used to check the TypeScript version on your local system? 

(Select all that apply.) Which of these commands is used to check the TypeScript version on your local system?

Is the Enum data type available in JavaScript?

Is the Enum data type available in JavaScript?

```
const school_idx: number[] = [402, 431, "812", 311]
```
In TypeScript, is this constant variable correctly defined?


<pre><code>const school_idx: number[] = [402, 431, &quot;812&quot;, 311]
</code></pre>
In TypeScript, is this constant variable correctly defined?

Remove the `"812"` string from the array.

Use a `union` data type for the variable.

Use a `tuple` data type for the variable.

Change all array values to a string or add more strings, to the array value.

```
const school_idx: number[] = [402, 431, "812", 311]
```

How can this code be corrected?

<pre><code>const school_idx: number[] = [402, 431, &quot;812&quot;, 311]
</code></pre>
How can this code be corrected?

An interface is a data type in TypeScript.

Interfaces in TypeScript are like models and contracts. They describe what a class or object’s methods and properties should be.

An interface is the same thing as a class in TypeScript. 

Which of the following is the best definition of an interface in TypeScript?

Which of the following is the best definition of an interface in TypeScript?

It may be correct, depending on what it's used for.


```
interface IWorker {
  name: string

  trimThread: (b: string) => {
     b.trim()
     return b
   }
}

```
Why is the code above not a valid TypeScript interface? 

<pre><code>interface IWorker {
 name: string

 trimThread: (b: string) =&gt; {
 b.trim()
 return b
 }
}

</code></pre>
Why is the code above not a valid TypeScript interface?

Interfaces only describe the properties and methods but don’t implement them. Abstract classes allow you to not only define or model but also implement the functions or methods.


Interfaces are used for both classes and JavaScript objects. Abstract classes are used only for classes.

What’s the difference between abstract classes and interfaces?

What’s the difference between abstract classes and interfaces?

It makes your code run or execute faster.


It makes it easier to differentiate interface variables from regular variables.

It allows the TypeScript compiler to identify it as an interface.

Why are interface variables usually named with an uppercase `I` or `T`?

Why are interface variables usually named with an uppercase <code>I</code> or <code>T</code>?

Take a quiz to test your understanding of TypeScript.

Course Overview

Node.js Features and Setup

TypeScript Features and Setup

SQL – Introduction and Setup

Understanding ORMs for Node.js

Prisma

Flight Booking System

TypeORM

Advanced Topics

School Grading System

Conclusion

Quiz: TypeScript Features and Setup