null vs undefined | variable life cycle | JavaScript Basics ( before Typescript , node js ) - 2 смотреть онлайн

JavaScript - null vs undefined Values/ Types
?Contents -Topics covered in this video :
➡️ What is Variable Life Cycle?
➡️ Different phases life cycle
➡️ Declaration phase
➡️ Initialization phase
➡️ Assignment phase
➡️ Difference null vs undefined
➡️ Similarities null vs undefined
➡️ Code in Online Editors
➡️ Differences between Reference and Primitive Values/ Types
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Previous Video :
Primitive Type vs Reference Type | JavaScript Basics ( before Typescript , node js ) - 1
https://youtu.be/M8Or1bA7HD0
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A variable can hold one of two value types: primitive values or reference values. When you assign a value to a variable, the JavaScript engine will determine whether the value is a primitive or reference value.
Under the hood When the engine works with variables, their lifecycle consists of the following phases

Javascript Interview Series | null vs undefined

Declaration phase is registering a variable in the scope. IN declaration phase variable is not defined.
Initialization phase is allocating memory and creating a binding for the variable in the scope. At this step, the variable is automatically initialized with undefined.
Assignment phase is assigning a value to the initialized variable. For example, let’s see how this really works.


Null vs Undefined - JavaScript
Difference between undefined and null
JavaScript null vs. undefined

#null #undefined #nullvsundefined

5 Interview Questions on NULL vs UNDEFINED
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Reference Vs Value In JavaScript
-TypeScript is an open-source programming language developed and maintained by Microsoft. It is a strict syntactical superset of JavaScript, and adds optional static typing to the language. In this typescript tutorial for beginners, we go over the fundamental concepts like variable declarations, variable types, functions, interfaces, classes and access modifiers.
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What is JavaScript ?
JavaScript was initially created to “make web pages alive”.

JavaScript is an open and cross platform, dynamic computer programming language which is developed to implement complex features on web pages . It is a scripting language , which is used on both client and server side. JavaScript is the language of web development. Most interactions you have with websites, including buttons you click, forms you fill, and emails you send, are implemented with JavaScript.

console.log(typeof null);
console.log(typeof undefined);
console.log(null === undefined);
console.log(null == undefined);
console.log(null === null);
console.log(null == null);
console.log(!null);
console.log(isNaN(1 + null));
console.log(isNaN(1 + undefined));

Output :
object
undefined
false
true
true
true
true
false
true


Data Types in JavaScript (Primitive & Reference Types)

JavaScript was initially created as a browser-only language, but it is now used in many other environments as well.

Object based vs object oriented language
Primitive types :
It consists of Number, String, Boolean, null, and undefined. -Es6 symbol

Example :
var a = 10;
var b = a;
console.log(a); // 10;
console.log(b); // 10;
Reference types :
It consists of Array, Object, and Function.

Example :
var x = {name: ‘MRK Tutorials’};
var y = x;
y.name = Subscribed;
console.log(x.name); // Subscribed
---------------------- Telugu ------------------------
➡️ How To Get Started in Figma : https://youtu.be/ZZRU6UIMsGA

➡️ Understanding Figma Workspace : https://youtu.be/ZZRU6UIMsGA

➡️Creating First Instagram Post : https://youtu.be/UUi5HNfoZMM

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---------------------- English ---------------------
➡️ What is DOM ? : https://youtu.be/a0ax0yXSHiw

➡️ What is Document Interface ? : https://youtu.be/EVNbGVMlANs

➡️ Property vs Method vs Attribute : https://youtu.be/dXEJcw7XNqQ

➡️ DOM Element : https://youtu.be/hr5yQ1VwF0I
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