WHAT IS JAVASCRIPT

• High-level, interpreted programming language.

• Conforms to the ECMAScript specification

• Multi-paradigm

• Runs on the client/browser as well as on the server (Node.js)

WHY LEARN JAVASCRIPT

• It is the programming language of the browser.

• Build very interactive user interfaces with frameworks like React

• Using in building very fast server-side and full stack application

• Used in mobile development (React Native, NativeScript, Ionic)

• Used in desktop application development (Electron JS)

WHAT YOU WILL LEARN IN THIS COURSE

• Variables and Data Types

• Arrays

• Object Literals

• Methods for strings, arrays, objects, etc

• Loops - for while, for…of, forEach, map

• Conditionals (if, ternary & switch)

• Functions (normal & arrow)

• OOPS (prototypes & classes

• DOM Selection

• DOM manipulation

• Events

• Basic Form Validation

Variables and Data Types

Console

console.log("This is console log");

console.error("This is use for console

console.warn("Warning Message");

Variable

var
let
const

var

var score = 20; var score = 30; console.log(score);

let

let score = 20; 
score = 30;
console.log(score);

const

const score = 20; 
console.log(score);

Data Types

String
Number
Boolean
null
undefined

String

const name = "Jhon";

Number

const age = 21;

const rating = 4.5;

Boolean

const x = true;

Undefined

const y = undefined;

let z;

JavaScript Variable Print

const name = "Jhon";
const age = 21;

console.log("My name is", name, "and I am", age, " 
years old");

Concatenation

const name = "Jhon";
const age = 21;

console.log("My name is " + name + " and I am " + age + " years old");

Template String

const name = "Jhon";
const age = 21;

console.log(`Hello, My name is ${name} and I'm ${age} years old`);

Type of JavaScript

const name = "Jhon";
const age = 21;
const rating = 4.5;
const x = true;
const y = undefined;
const z;

console.log(typeof name); 
console.log(typeof age); 
console.log(typeof rating); 
console.log(typeof x); 
console.log(typeof y); 
console.log(typeof z);

Substring

let name = "Mahbubul Alam";
console.log(name.substring(0, 5));

Uppercase

let name = "Mahbubul Alam";
console.log(name.toUpperCase());

Lowercase

let name = "Mahbubul Alam";
console.log(name.toLowerCase())

Split

let name = 'Mahbubul, Sakib, Nakib, Abdullah'
console.log(name.split(', '))