> ## Documentation Index
> Fetch the complete documentation index at: https://blog.sumathi.dev/llms.txt
> Use this file to discover all available pages before exploring further.

#  Practice Set 4

* What will the following print in Javascript ? `console.log("kal\"".length)`
* Explore the includes , startsWith and endsWith functions of a string
* Write a program to correct a given srting to lowercase
* Extract the amount out of this string "Please give Rs 1000"
* Try to change the 4th character of a given string

```js theme={null}
// Practixe set 4
let str = "kal\t";

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

// Problem no 2
const word = "fox";
console.log(
  `The word "${word}" ${sentence.includes(word) ? "is" : "is not"} in the sentence`,
);
// Problem no 3
console.log(word.toUpperCase())
// Problem no 4
let str2 = "The amont is Rs 1000";
let amount = str2.slice("The amont is Rs ".length)
console.log(amount)
console.log(typeof (amount))
amount = Number.parseInt(amount)
console.log(typeof amount)

// Problem 5
let frined = "Pavan";
frined[3] = "d" // string is immutable and cannot be changed
console.log(frined)
```