MERN

#pass or fail

function cr(marks,callback)

{

    console.log("Calculatinggg....")

    if(marks>=35)

    {

        callback("Passed",marks);

    }

    else {

        callback("Failed",marks);

    }

}

 function dr(results,marks)

 {

    console.log ("you are",results,"with",marks);

 }

 cr(45,dr);

 cr(20,dr);

#PIZZA PROGRAM

const EventEmitter=require('node:events');

const emitter=new EventEmitter();

emitter.on("order_pizza",(size,top)=>

{console.log("order recieved for a",size,"with ",top);

});

emitter.on("order_pizza",(size)=>{

    if(size=='large'){

        console.log("Serving a compliment drink");

    }});

emitter.emit("order_pizza","small","cheese");

emitter.emit("order_pizza","large","peperoni");

 

#RCB PROGRAM

class RCB

{

    constructor(tname,cname,slogan)

    {

        this.tname=tname

        ;

        this.cname=cname;

        this.slogan=slogan;

    }

    Details()

    {

        console.log("Team name is",this.tname);

        console.log("Captain name is",this.cname);

    }

    Slogan()

    {

        console.log("Slogan is",this.slogan);

    }

    greet()

    {

        console.log("hii captain",this.cname,"lead ",this.tname,"to victory!!!");

    }

}

 const team= new RCB("Royal challengers Bengaluru","Rajat patidar","Ee sala cup namdee!!!");

 team.Details();

 team.Slogan();

 team.greet();

 

#Arithmetic

function calculate(a, b, callback) {

  console.log("Calculating...");

  callback(a, b);

}

function add(x, y) {

  console.log("Addition:", x + y);

}

 function sub(x, y) {

  console.log("Subtraction:", x - y);

}

function mul(x, y) {

  console.log("Multiplication:", x * y);

}

function div(x, y) {

  console.log("Division:", x / y);

}

calculate(7, 3, add);

calculate(7, 3, mul);

calculate(7, 3, sub);

calculate(7, 3, div);

 

#Counter.js  #Functional component

import React, { useState } from "react";

function Counter() {

  const [count, setCount] = useState(0);

  const increment = () => {

    setCount(count + 1);

  };

  return (

    <div>

      <h2>Functional Counter: {count}</h2>

      <button onClick={increment}>Increment</button>

    </div>);}

export default Counter;

 

#App.js

import React from "react";

import Counter from './Counter';

function App() {

  return <Counter />;}

export default App;

 

#Counter.js #Class component

import React, { Component } from "react";

class Counter extends Component {

  state = { count: 0 };

  increment = () => {

    this.setState({ count: this.state.count + 1 });

  };

  render() {

    return (

      <div>

        <h2>Class Counter: {this.state.count}</h2>

        <button onClick={this.increment}>Increment</button>

      </div>

    ); }}

 

export default Counter;

#App.js

import React from "react";

import Counter from './Counter';

function App() {

  return <Counter />;

}

export default App;

AUTHOR PROGRAM

function Book(title,author,year)

{

this.title=title;

this.author=author;

this.year=year;

this.getdetails=function(){

    console.log("title:",this.title);

    console.log("author:",this.author);

    console.log("year:",this.year);

 

};

}

const book1 = new Book("Alive", "karthi", "2025");

const book2 = new Book("Last Day", "love me", "2025");

console.log("book1 details:");

book1.getdetails();

console.log("book2 details:");

book2.getdetails();

cd C:\Users\karthik\Desktop\KARTHIK.S

npm init -y

npm install react react-dom

npx create-react-app counter-app

cd counter-app

npm start