TypeScript for Backend

Seiji Villafranca

developing Rest APIs using Nest Js

Seiji Villafranca

github.com/SeijiV13

Technical Lead, Frontier Software Asia Philippines

Trainer, RakSquad

Auth0 Ambassador

Community Lead, AngularPH,

seijivillafranca.com

Talks

Typescript and Nest

Let me tell you some JavaScript First

JavaScript?

Programming Language for the Web

Makes Web Pages Interactive

Can Validate Data

Without it, Pages our just Pages!

Well... Javascript is basically for Interacting with the UI

A little about History

Developed in 10 Days

Brendan Eich, September 1995

Mocha

LiveScript

JavaScript

JavaScript Vs. Java

Don't be confused they are not related to each other!

JavaScript is called JavaScript for marketing strategies

Some Facts!

Where is JavaScript Today?

Refrence: https://codeburst.io/javascript-trends-in-2020-b194bebc5ef8

Companies that uses JavaScript

Uses NodeJS on Azure Cloud Platform

Internet of Things (IoT)

Microsoft

Companies that uses JavaScript

Front End is Pure JavaScript

Developed KrakenJS (own version of express)

Companies that uses JavaScript

Gmail Web Client, Google Docs

Has own JS Framework AngularJS, Angular

Developed V8 for Chrome which is the heart of Node JS

Seeing JavaScript for the first time

Superset Languages

Prototypes

Dynamic Types

TypeScript

Generics

Interfaces

ES6

Types

A sample code here

class Student {
    fullName: string;
    constructor(public firstName: string, public middleInitial: string, 
        public lastName: string) {
            this.fullName = firstName + " " + middleInitial + " " + lastName;
    }
}

interface Person {
    firstName: string;
    lastName: string;
}

let user = new Student("Jane", "A", "Doe");