2. Read a string from the user, Find its length. Extract the word “JavaScript” using substring() or slice(). Replace one word with another word and log the new string. Write a function isPalindrome(str) that checks if a given string is a palindrome (reads the same backward).
PROGRAM:
const readline = require('readline');
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout
});
function isPalindrome(str) {
const reversedStr = str.split('').reverse().join('');
return str === reversedStr;
}
rl.question('Enter a string: ', (inputString) => {
const lengthOfString = inputString.length;
console.log(`Length of the string: ${lengthOfString}`);
const start = inputString.indexOf("JavaScript");
if (start !== -1) {
const extractedWord = inputString.slice(start, start + "JavaScript".length);
console.log(`Extracted word: ${extractedWord}`);
} else {
console.log("Word 'JavaScript' not found in the string.");
}
const replacedString = inputString.replace('JavaScript', 'JavaScript lab program');
console.log(`New string after replacement: ${replacedString}`);
const isStringPalindrome = isPalindrome(inputString);
console.log(`Is the string a palindrome? ${isStringPalindrome}`);
rl.close();
});Step 4: To run program use below command:
- Open the vscode integrated terminal through the menu by selecting and type the below command to run the program.
node index.jsOUTPUT:
********************************output 1********************************
Enter a string: I am learning JavaScript from vtucircle website
Length of the string: 47
Extracted word: JavaScript
New string after replacement: I am learning JavaScript lab program from vtucircle website
Is the string a palindrome? false
********************************output 2********************************
Enter a string: madam
Length of the string: 5
Word 'JavaScript' not found in the string.
New string after replacement: madam
Is the string a palindrome? true