Ch 4 String Practice Set.js

//                 Ch 4 String Practice Set

// Q1)Write a program that counts the number of characters in a given string.



// const str = "Hello, World!";
// const count = str.length;
// console.log(count); // Output: 13


// Q2)Write a program that checks if a string contains a specific substring.



// const str = "Hello, World!";
// const substring = "World";
// const containsSubstring = str.includes(substring);
// console.log(containsSubstring); // Output: true



// Q3)Write a program that converts a string to uppercase.



// const str = "Hello, World!";
// const uppercaseStr = str.toUpperCase();
// console.log(uppercaseStr); // Output: HELLO, WORLD!



// Q4)Write a program that extracts a portion of a string based on start and end indexes.



// const str = "Hello, World!";
// const extractedStr = str.slice(7, 12);
// console.log(extractedStr); // Output: World


// Q5)Write a program that replaces a specific substring with another substring.



// const str = "Hello, John!";
// const newStr = str.replace("John", "Alice");
// console.log(newStr); // Output: Hello, Alice!



// Q6)Write a program that splits a string into an array of substrings based on a delimiter.



// const str = "Hello, World!";
// const arr = str.split(",");
// console.log(arr); // Output: ["Hello", " World!"]

// Q7)Write a program that checks if a string starts with a specific character or substring.



// const str = "Hello, World!";
// const startsWithHello = str.startsWith("Hello");
// console.log(startsWithHello); // Output: true


// Q8)Write a program that checks if a string ends with a specific character or substring.



// const str = "Hello, World!";
// const endsWithWorld = str.endsWith("World!");
// console.log(endsWithWorld); // Output: true


// Q9)Write a program that trims whitespace from the beginning and end of a string.



// const str = "   Hello, World!   ";
// const trimmedStr = str.trim();
// console.log(trimmedStr); // Output: Hello, World!


// Q10)Write a program that checks if a string is empty.



// const str = "";
// const isEmpty = str.length === 0;
// console.log(isEmpty); // Output: true