Today We <Code />

JS Review

What is JavaScript?

A. It's a server-side language

B. It's a client-side language

C. It's an embedded devices language

D. All of the above

So what can it do?

Everything!

<!DOCTYPE html>
<html lang="en">
   <head>
      <meta charset="utf-8">
      <meta name="viewport" content="width=device-width,initial-scale=1">
      <meta name="mobile-web-app-capable" content="yes">
      <title>Site Builder | Thinkific</title>
      <meta name="mobile-web-app-capable" content="yes">
      <meta name="theme-color" content="#ffffff">
      <meta name="application-name" content="site-builder">
      <link rel="apple-touch-icon" sizes="57x57" href="https://cdn-internal.thinkific.com/site-builder/icons-319f6061bac6f3160e60f5f7b0eb3168/apple-touch-icon-57x57.png">
      <link rel="apple-touch-icon" sizes="60x60" href="https://cdn-internal.thinkific.com/site-builder/icons-319f6061bac6f3160e60f5f7b0eb3168/apple-touch-icon-60x60.png">
      <link rel="apple-touch-icon" sizes="72x72" href="https://cdn-internal.thinkific.com/site-builder/icons-319f6061bac6f3160e60f5f7b0eb3168/apple-touch-icon-72x72.png">
      <link rel="apple-touch-icon" sizes="76x76" href="https://cdn-internal.thinkific.com/site-builder/icons-319f6061bac6f3160e60f5f7b0eb3168/apple-touch-icon-76x76.png">
      <link rel="apple-touch-icon" sizes="114x114" href="https://cdn-internal.thinkific.com/site-builder/icons-319f6061bac6f3160e60f5f7b0eb3168/apple-touch-icon-114x114.png">
      <link rel="apple-touch-icon" sizes="120x120" href="https://cdn-internal.thinkific.com/site-builder/icons-319f6061bac6f3160e60f5f7b0eb3168/apple-touch-icon-120x120.png">
      <link rel="apple-touch-icon" sizes="144x144" href="https://cdn-internal.thinkific.com/site-builder/icons-319f6061bac6f3160e60f5f7b0eb3168/apple-touch-icon-144x144.png">
      <link rel="apple-touch-icon" sizes="152x152" href="https://cdn-internal.thinkific.com/site-builder/icons-319f6061bac6f3160e60f5f7b0eb3168/apple-touch-icon-152x152.png">
      <link rel="apple-touch-icon" sizes="180x180" href="https://cdn-internal.thinkific.com/site-builder/icons-319f6061bac6f3160e60f5f7b0eb3168/apple-touch-icon-180x180.png">
      <meta name="apple-mobile-web-app-capable" content="yes">
      <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
      <meta name="apple-mobile-web-app-title" content="site-builder">
      <link rel="icon" type="image/png" sizes="32x32" href="https://cdn-internal.thinkific.com/site-builder/icons-319f6061bac6f3160e60f5f7b0eb3168/favicon-32x32.png">
      <link rel="icon" type="image/png" sizes="16x16" href="https://cdn-internal.thinkific.com/site-builder/icons-319f6061bac6f3160e60f5f7b0eb3168/favicon-16x16.png">
      <link rel="shortcut icon" href="https://cdn-internal.thinkific.com/site-builder/icons-319f6061bac6f3160e60f5f7b0eb3168/favicon.ico">
      <link rel="apple-touch-startup-image" media="(device-width: 320px) and (device-height: 480px) and (-webkit-device-pixel-ratio: 1)" href="https://cdn-internal.thinkific.com/site-builder/icons-319f6061bac6f3160e60f5f7b0eb3168/apple-touch-startup-image-320x460.png">
      <link rel="apple-touch-startup-image" media="(device-width: 320px) and (device-height: 480px) and (-webkit-device-pixel-ratio: 2)" href="https://cdn-internal.thinkific.com/site-builder/icons-319f6061bac6f3160e60f5f7b0eb3168/apple-touch-startup-image-640x920.png">
      <link rel="apple-touch-startup-image" media="(device-width: 320px) and (device-height: 568px) and (-webkit-device-pixel-ratio: 2)" href="https://cdn-internal.thinkific.com/site-builder/icons-319f6061bac6f3160e60f5f7b0eb3168/apple-touch-startup-image-640x1096.png">
      <link rel="apple-touch-startup-image" media="(device-width: 375px) and (device-height: 667px) and (-webkit-device-pixel-ratio: 2)" href="https://cdn-internal.thinkific.com/site-builder/icons-319f6061bac6f3160e60f5f7b0eb3168/apple-touch-startup-image-750x1294.png">
      <link rel="apple-touch-startup-image" media="(device-width: 414px) and (device-height: 736px) and (orientation: landscape) and (-webkit-device-pixel-ratio: 3)" href="https://cdn-internal.thinkific.com/site-builder/icons-319f6061bac6f3160e60f5f7b0eb3168/apple-touch-startup-image-1182x2208.png">
      <link rel="apple-touch-startup-image" media="(device-width: 414px) and (device-height: 736px) and (orientation: portrait) and (-webkit-device-pixel-ratio: 3)" href="https://cdn-internal.thinkific.com/site-builder/icons-319f6061bac6f3160e60f5f7b0eb3168/apple-touch-startup-image-1242x2148.png">
      <link rel="apple-touch-startup-image" media="(device-width: 768px) and (device-height: 1024px) and (orientation: landscape) and (-webkit-device-pixel-ratio: 1)" href="https://cdn-internal.thinkific.com/site-builder/icons-319f6061bac6f3160e60f5f7b0eb3168/apple-touch-startup-image-748x1024.png">
      <link rel="apple-touch-startup-image" media="(device-width: 768px) and (device-height: 1024px) and (orientation: portrait) and (-webkit-device-pixel-ratio: 1)" href="https://cdn-internal.thinkific.com/site-builder/icons-319f6061bac6f3160e60f5f7b0eb3168/apple-touch-startup-image-768x1004.png">
      <link rel="apple-touch-startup-image" media="(device-width: 768px) and (device-height: 1024px) and (orientation: landscape) and (-webkit-device-pixel-ratio: 2)" href="https://cdn-internal.thinkific.com/site-builder/icons-319f6061bac6f3160e60f5f7b0eb3168/apple-touch-startup-image-1496x2048.png">
      <link rel="apple-touch-startup-image" media="(device-width: 768px) and (device-height: 1024px) and (orientation: portrait) and (-webkit-device-pixel-ratio: 2)" href="https://cdn-internal.thinkific.com/site-builder/icons-319f6061bac6f3160e60f5f7b0eb3168/apple-touch-startup-image-1536x2008.png">
   </head>
   <body>
      <noscript>If you're seeing this message, that means <strong>JavaScript has been disabled on your browser</strong>, please <strong>enable JS</strong> to make this app work.</noscript>
      <div id="site-builder"></div>
      <script type="text/javascript" src="https://cdn-internal.thinkific.com/site-builder/main.44cf3a6c0399948fce87.js"></script>
   </body>
</html>

What is JavaScript?

  • Dynamic
  • Interpreted
  • Object oriented
  • Can make computations
  • Has 7 data types
  • Has conditionals
  • Has loops

JS Data Types

  1. Boolean
  2. Number
  3. String
  4. Object
  5. Function
  6. null
  7. Symbol

Variables

let x = 1;

const y = 2;

Conditionals

if (condition) {
  // do something
}

Loops

while (condition) {
  // do something
}
for (let i = 0; i < arr.length; i++) {
  // do something
}

Functions

function test(arg1, arg2) {
  // do something
}

Arrays

const arr = ['foo', 'bar', 'baz']

arr[0] // "foo"
arr[1] // "bar"
arr[2] // "baz"

Objects

const car = {
  color: 'red',
  fuel: '50%',
  topSpeed: 200
}

car.color // "red"
car.fuel // "50%"
car.topSpeed // 200

Object Oriented

class Car {
  constructor(color, fuelType) {
    this.color = color;
    this.fuelType = fuelType;
  }

  paint(newColor) {
    this.color = newColor;
  }
}

const car1 = new Car("Red", "Diesel");
const car2 = new Car("Green", "Electric");

car.paint("brown");

Algorithms

1. Understand and Analyse the Problem

Can you explain the problem to a layman?

2. Go through the sample inputs and examples thoroughly

fib(5) = 8

A linked list with 5 nodes

A linked list with no nodes

A linked list with 1 node

3. Break down the problem

  • Try to make a flow chart or a UML for the problem in hand
  • Divide the problem into different modules or sub-problems
  • Try to make independent functions for each sub-problem
  • Connect those sub-problems by calling them in the required order, or as necessary

4. Write the Algorithm

Write the solution in pseudo code

Node: {
  content: any,
  next: Node
}

LinkedList: {
  head: Node,
  tail: Node
}

newLinkedList() -> LinkedList
newNode(content) -> Node

add(Node, LinkedList) -> null
delete(Node, LinkedList) -> null

More LinkedList use cases

  • Implement more complex Data Structures
    • Tree
    • Graph
    • Stack & Queue
  • Music player app
  • Operating Systems & Databases
    • The C memory allocation function (malloc)
    • Hashtables use chaining to resolve hash collisions

Hash Tables

  • Browser History
  • Undo/Redo
  • Code execution
  • Background jobs
  • Requests to server
  • The World Wide Web!
  • Search algorithms
    • Facebook Graph
  • Find path from A to B
    • Google maps
    • Flight search
  • Social Networks
    • Connecting 2 people

Why learn Data Structures?

Agenda

  • More on OOP (Object-Oriented Programming)
    • Static methods
    • Setters and Getters
    • Inheritance
  • Asynchronous JavaScript
    • Callbacks
    • Promises
    • Async/await
  • Ajax

Object Oriented

class Car {
  constructor(color, fuelType) {
    this.color = color;
    this.fuelType = fuelType;
  }

  paint(newColor) {
    this.color = newColor;
  }
}

const car1 = new Car("Red", "Diesel");
const car2 = new Car("Green", "Electric");

car.paint("brown");

js-fundamentals

By Mujtaba Al-Tameemi

Made with Slides.com

js-fundamentals

  • 254

More from Mujtaba Al-Tameemi