JavaScript in One Shot

01. History of JavaScript

History

In 1995, A Netscape (browser) programmer named “Brandan Eich” developed a scripting language in just 10 days.

Originally name (first name):- Mocha

Second name:- LiveScript

At that time java is famous programming language. So, for marketing purpose LiveScript changed into JavaScript.

Java and Javascript both are different programming language nothing is common.

$Mocha -> LiveScript -> JavaScript$

In 1997, there is another famous browser that was Internet Explorer (Microsoft browser) Then, Microsoft copied JavaScript features made own language named as Jscript.

In browser war (Netscape vs Internet Explorer)

Netscape:- JavaScript Internet Explorer:- Jscript

EcmaScript is born…

EcmaScript

Ecma international is an industry association founded in 1996, dedicated to the standardization of information and communication systems.

$ JavaScript + Ecma(Rules) => EcmaScript $

Problem Solved:- We can same implement scripting language for different browser.

First EcmaScript:

ES1 -> 1997
ES5 -> 2009 (Lots of new features)
ES6 -> 2015 (Biggest update for JS)
ES6 is also known as Modern JavaScript

Ecma have a technical community known as TC39 had decided that after 2015 We release javascript with new features every year (Annual Release).

Features

Case Sensitive
Dynamic typed
Cross-platform
Interpreted
Object-Oriented Scripting Language
Backward Compatible

02. Variables

Variables:-

Variables stores the data which can be changed or used when we need. There are these Keywords to declare a variable.

Keywords are the predefined words in programming languages.

Var:

  
var name = 10;

Let:

  
let name = 20;

Const:

  
const pi = 3.14;

03. Datatype

There are two types of data.

Primitive
Non-Primitive

Primitive Datatype

Numbers
Null
String
Bool
Undefined
Bigint
Symbol

Non-Primitive Datatype

Array
Object
RegExp

String

String are used to store textual form of data like word, sentence. It follows zero based indexing.

  
let str = "pro";
let str = "pro";
let str = "pro";

String Method:-

Methods	Methods
trim()	slice()
charAt()	tastring()
concat()	substring()
indexof()	toUpperCase()
lastIndexOf()	toLowerCase()

Undefined

Accessing on uninitialized variable returns undefined.

  
let str;
console.log(str);   //undefined

Accessing a non-existing property of an object returns undefined.
Accessing a out-of-bounds array element return undefined.

Null

null means ‘no value’ assign to variable.
typeof null return ‘object’.
Null is treated as false value.

Bigint

04. JavaScript Hacks

Convert string to number

Put the pluse(+) before the string.

For Example:

  
let str = "9";

Convert numbers into string

Add a empty string with the number.

For Example:

  
let num = 10;
console.log(typeof(num + ""));

05. Ternary Operator

Boolean Data Type

Truthy and Falsy Values

Control Flow

Switch Statement

For Loop

While, Do While Loop

Functions

Arrays

Array Methods

Primitive vs Reference Types

Spread Operator

Array Destructing

Objects Introduction

Iterate Object

Object Destructuring

Arrow Functions

Hoisting

Lexical Scope

Block Scope vs Function Scope

Default Parameter

Rest Parameters

Parameter Destructing

Call Back Function

Sets in JavaScript

Useful Set methods

Map data Structure

Methods in Maps

Create Own Methods

This Keywords

Call, Apply, Bind Methods

Prototype

New Keywords

Keep Learning!
    Keep Coding!
Keep Smiling :)

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