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Factory Functions in JS

This is a functions which creates new object. This function is neither a constructor function, nor a "class".

function createPerson(name) {
  let person = {};
  person.name = name;
  return person;
}

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Interfaces in TypeScript

interface User {
  membership: string;
  active: boolean;
  status?: boolean; // optional prop
  [propName: string]: any; // not aware of the names of the rest of the props
}

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Namespaces in TypeScript

appInfo.ts

namespace AppInfo {
  const version: string = "1.0.0";

  export function getVersion() {
    return version;
 }

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hasOwnProperty

const person = {
  name: null
}

// create new object and set its __proto__ to point to person object
const ivan = Object.create(person);

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Object.defineProperty

Todo

MDN

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Object.create

const person = {
  name: null
}

// create new object and set its __proto__ to point to person object
const ivan = Object.create(person);

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Classes in TypeScript

Types of properties

• public(the default case)
• private
  • you can only access it from the class. Cannot set/read it from outside.

  class Human {
    private type: string = "terran";
    constructor(public name: string) {
  

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Rest parameters

function logNumbers(...args) {
  console.log(args); // type: array
}

logNumbers(1,2)
// [1, 2]

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"Inheritance" in JS

class Human {
    constructor(name) {
        this.name = name
    }
   
}

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Static methods in JS "Classes"

Methods that must be invoked on the class itself, not on its instances

class Human {
  constructor(name) {
    this.name = name;
  }