Basic JavaScript Programs

 

Table of Content

• Program To Print Hello World
• Program to Add Two Numbers
• Program to Swap Two Variables
• Program to Convert Kilometers to Miles
• Program to Convert Celsius to Fahrenheit

1) Program To Print Hello World

1.Using console.log()
// the hello world program console.log('Hello World');
2. Using alert()
// the hello world program alert("Hello, World!");
3. Using document.write()
// the hello world program document.write('Hello, World!');

2)Program to Add Two Numbers

1.Add Two Numbers
const num1 = 5; const num2 = 3; // add two numbers const sum = num1 + num2; // display the sum console.log('The sum of ' + num1 + ' and ' + num2 + ' is: ' + sum);
2.Add Two Numbers Entered by the User
// store input numbers const num1 = parseInt(prompt('Enter the first number ')); const num2 = parseInt(prompt('Enter the second number ')); //add two numbers const sum = num1 + num2; // display the sum console.log('The sum of ${num1} and ${num2} is ${sum}');

3)Program to Swap Two Variables

1.Using a Temporary Variable
//JavaScript program to swap two variables //take input from the users let a = prompt('Enter the first variable: '); let b = prompt('Enter the second variable: '); //create a temporary variable let temp; //swap variables temp = a; a = b; b = temp; console.log('The value of a after swapping: ${a}'); console.log('The value of b after swapping: ${b}');
2.Using es6(ES2015) Destructuring assignment

//JavaScript program to swap two variables

//take input from the users
let a = prompt('Enter the first variable: ');
let b = prompt('Enter the second variable: ');

//using destructuring assignment
[a, b] = [b, a];

console.log('The value of a after swapping: ${a}');
console.log('The value of b after swapping: ${b}');

4)Program to Convert Kilometers to Miles

Kilometers to Miles
// taking kilometers input from the user const kilometers = prompt("Enter value in kilometers: ") // conversion factor const factor = 0.621371 // calculate miles const miles = kilometers * factor console.log(`${kilometers} kilometers is equal to ${miles} miles.`);
Miles to Kilometers
// taking miles input from the user const miles = prompt("Enter value in miles: ") // conversion factor const factor = 0.621371 // calculate kilometers const kilometers = miles / factor console.log('${miles} miles is equal to ${kilometers} kilometers.');

5)Program to Convert Celsius to Fahrenheit

Celsius to Fahrenheit
// program to convert celsius to fahrenheit // ask the celsius value to the user const celsius = prompt("Enter a celsius value: "); // calculate fahrenheit const fahrenheit = (celsius * 1.8) + 32 // display the result console.log('${celsius} degree celsius is equal to ${fahrenheit} degree fahrenheit.');
Fahrenheit to Celsius
// program to convert fahrenheit to celsius // ask the fahrenheit value to the user const fahrenheit = prompt("Enter a fahrenheit value: "); // calculate celsius const celsius = (fahrenheit - 32) / 1.8 // display the result console.log('${fahrenheit} degree fahrenheit is equal to ${celsius} degree celsius.');