JS-Fundamental

01-JS Fundamentals | Javascript introduction

JS introduction and Variable declaration and scope

January 6, 2022

Introduction to JS

https://jsbin.com
- Run HTMS, CSS, JS online

What is JavaScript?

JavaScript is a dynamic, weakly typed programming language which is compiled at runtime.
It can be executed as part of a webpage in a browser or directly on any machine (“host environment”).
JavaScript was created to make webpages more dynamic (e.g. change content on a page directly from inside the browser).

[Read More]

#JS-Fundamental #Javascript

02-JS Fundamentals | Data-types in Javascript

Primitive, Non-primitive data-types and Garbage collection

January 7, 2022

Javascript Data Types

Primitive
Non-primitive(reference/object/json)

Primitive

Data that is not an object
All primitives are immutable i.e., they cannot be altered.
- Stored in Stack
- Copies the data(Copy by value)

[Read More]

#JS-Fundamental #Javascript

03-JS Fundamentals | Operators in Javascript

Operator and type conversion

January 8, 2022

Operators in Javascript

Comparison Operators

Equality Operators: `== vs ===`

=== –> Strict equal to
- true if the operands are equal and of the same type
!== –> Strict not equal to
- true if the operands are equal but of different type or not equal at all

[Read More]

#JS-Fundamental #Javascript

04-JS Fundamentals | Adv Operators in Javascript

Truthy, Falsy Values and Important Operations

January 9, 2022

Truthy and Falsy Values

5 falsy values –> 0, "", undefined, null, NaN
Everything else is True

[Read More]

#JS-Fundamental #Javascript

05-JS Fundamentals | Function in Javascript

Different types of function in Javascript

January 10, 2022

Function in Javascript

Different Way of Defining Function

Function Declaration / Function Statement
- Hoisted to top, can be declared anywhere in the file (i.e. also after it’s used)
Function Expression
- Hoisted to top but not initialized/defined, can’t be declared anywhere in the file (i.e. not after it’s used)
Arrow function
IIFEs

[Read More]

#JS-Fundamental #Javascript

06-JS Fundamentals | Array in Javascript

Array and Array methods

January 11, 2022

Array and Array Methods

Arrays are basically single objects that contain multiple values stored in a list
JavaScript array is an object that represents a collection of similar type of elements.
There are 2 ways to construct array in JavaScript
- By array literal
- By using an Array constructor (using new keyword)

[Read More]

#JS-Fundamental #Javascript

07-JS Fundamentals

Importing script properly

January 12, 2022

Different Ways of Adding JavaScript to a Page

Inline JavaScript
External JavaScript

Inline JavaScript

In HTML, JavaScript code is inserted between <script> and </script> tags.
Scripts can be placed in the <body> or <head> (or both) section of an HTML page.

[Read More]

#JS-Fundamental #Javascript

08-JS Fundamentals

Variables, If-else and Switch case

January 13, 2022

Variable declaration in JS

let
- It has a block-scope
const
- Used for unchanging variable
- This can’t be re-defined
var
- No block-scope
- var variables are either function-wide or global
- they are visible through blocks.
let and const basically replace var.
var should not be used anymore

[Read More]

#JS-Fundamental #Javascript

09-JS Fundamentals | Loops in Javascript

Different types of loops in JS

January 14, 2022

Loops in Javascript

for loop
- Execute code a certain amount of times (with counter variable)
for-of loop
- Execute for every element in an array
for-in loop
- Execute for every key in an object
while loop
- Execute code as long as a condition is true

[Read More]

#JS-Fundamental #Javascript

10-JS Fundamentals | Exception in Javascript

Exception handling

January 15, 2022

Exception

An exception signifies the presence of an abnormal condition which requires special operable techniques
Error Types
- Syntax Error
  - Mistake in the pre-defined syntax
- Runtime Error
  - Runtime errors are known as Exceptions.
- Logical Error
  - Logical mistake in the program, abnormal output

[Read More]

#JS-Fundamental #Javascript

01-JS Fundamentals | Javascript introduction

JS introduction and Variable declaration and scope

Introduction to JS

What is JavaScript?

02-JS Fundamentals | Data-types in Javascript

Primitive, Non-primitive data-types and Garbage collection

Javascript Data Types

Primitive

03-JS Fundamentals | Operators in Javascript

Operator and type conversion

Operators in Javascript

Comparison Operators

Equality Operators: == vs ===

04-JS Fundamentals | Adv Operators in Javascript

Truthy, Falsy Values and Important Operations

Truthy and Falsy Values

05-JS Fundamentals | Function in Javascript

Different types of function in Javascript

Function in Javascript

Different Way of Defining Function

06-JS Fundamentals | Array in Javascript

Array and Array methods

Array and Array Methods

07-JS Fundamentals

Importing script properly

Different Ways of Adding JavaScript to a Page

Inline JavaScript

08-JS Fundamentals

Variables, If-else and Switch case

Variable declaration in JS

09-JS Fundamentals | Loops in Javascript

Different types of loops in JS

Loops in Javascript

10-JS Fundamentals | Exception in Javascript

Exception handling

Exception

Equality Operators: `== vs ===`