Practice Set on Strings in JavaScript

 //Chapter - 4 : Practice Set

//Question 1 : What will the following print in JavaScript ?

//console.log("har\"".length);

let str = "har\"";

console.log(str.length);

//Question 2 : Explore the included, startsWith & endsWith functions of a string

const sentence = "The quick brown for jumps over the lazy dog.";

const word = "fox2";

console.log(sentence.includes(word));   //.includes() always return True or False

console.log(`The word '${word}' ${sentence.includes(word) ? 'is' : 'is not'} in the sentence`);

console.log(sentence.startsWith("The"));

console.log(sentence.startsWith("Sat"));

console.log(sentence.startsWith("The", 0));

console.log(sentence.startsWith("The", 1));

console.log(sentence.endsWith("dog."));

console.log(sentence.endsWith("Sat"));

console.log(sentence.endsWith("dog.", 44));

console.log(sentence.endsWith("dog.", 40));

//Question 3 : Write a program to convert a given string to lowercase

const sentenceTwo = "HELLO WORLD, HOW are YOU ?";

console.log(sentenceTwo.toLowerCase());

console.log(sentence.toUpperCase());

//Question 4 : Extract the amount out of this string "please give Rs 1000"

let str2 = "Please give Rs 1000";

let amount = Number.parseInt(str2.slice(15));

console.log(amount);

console.log(typeof amount);

//Question 5 : Try to change 4rth character of a given string were you able to do it ?

let friend = "Deepika";

friend[3] = "R";

console.log(friend);    //"friend" is not changed, because string is immutable

OUTPUT :

4 false The word 'fox2' is not in the sentence true false true false true false true false hello world, how are you ? THE QUICK BROWN FOR JUMPS OVER THE LAZY DOG. 1000 number Deepika