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JS Programming Basics

Aaj hum JS (JavaScript) programming ke mool tatv padhenge, aur kuch mukhya chijon ko samjhenge. JS ek popular programming language hai, jo aapke websites ko interactive banane me madad karta hai. Agar aapko programming ki shuruaat karni hai, toh JS ek achha vikalp hai.

1. JS kya hai?
JS ek high-level, interpreted programming language hai, jo originally web development ke liye design ki gayi thi. Isse aap apne web pages me animations, interactive forms, aur dynamic content jaise features add kar sakte hain.

2. JavaScript vs Java:
Ek baat ka dhyaan rakhein ki JavaScript aur Java alag-alag programming languages hain. Unka naam hi ek jaisa hai lekin nature mein bilkul alag hai. Java ek compiled language hai, jabki JavaScript ek interpreted language hai.

3. JavaScript ka use kahan hota hai?
JavaScript ka use client-side aur server-side dono tarikon se hota hai.

Client-side: Isse aap apne web pages par interactivity add kar sakte hain. For example, ek button click karne se kuch hide/show karna, form validation karna, animations lagana, etc.

Server-side: Node.js ke madhyam se, aap JavaScript ka use server par bhi kar sakte hain, jisse dynamic web applications develop ki ja sakti hain.

4. JS Variables:
Variables, values ko store karne ke liye use hoti hain. JS mein variables declare karne ke liye var, let, ya const ka use hota hai. Example:

javascript
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var naam = 'phd gyanwala';
let umar = 25;
const PI = 3.14;
5. Data Types:
JS mein kuch basic data types hote hain jaise ki Strings (shabd), Numbers (ank), Booleans (Boolean), Arrays (suchi), aur Objects (vyakti).

6. Functions:
Function ek block of code hota hai, jo ek specific task perform karta hai. Aap function ko baar-baar call kar sakte hain. Example:

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function welcomeMessage(name) {
console.log('Namaste ' + name + '!');
}

welcomeMessage('dosto');
7. Conditional Statements:
Conditional statements, kisi condition ke anusaar code ko execute karne me madad karte hain. JS mein "if", "else if", aur "else" ka use hota hai.

javascript
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var time = 20;

if (time < 12) {
console.log('Good morning!');
} else if (time < 18) {
console.log('Good afternoon!');
} else {
console.log('Good evening!');
}
8. Loops:
Loops ek code block ko baar-baar execute karne me madad karte hain. JS mein "for" aur "while" loops ka use hota hai.

javascript
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for (var i = 1; i <= 5; i++) {
console.log('Number: ' + i);
}

var j = 1;
while (j <= 5) {
console.log('Number: ' + j);
j++;
}
9. Events:
Events, user ke actions (jaise ki button click, mouse hover, etc.) ko handle karne me help karte hain. Aap event listeners ka use karke events ko handle kar sakte hain.

var button =

button.addEventListener('click', function() {
console.log('Button clicked!');
});
10. JavaScript Libraries:
JS ke kuch popular libraries hain jinse aap apne development process ko aur bhi asaan bana sakte hain, jaise ki React.js, Angular.js, aur Vue.js.

Happy coding! :)