Some important topics in JavaScript

1) String.prototype.indexOf()

This method find the index number of a string type variable

const text = “We love our country”;

console.log(text); //We love our country

console.log(text.indexOf(“our”)); //8

2) String.prototype.includes()

This method return Boolean type if the word present in the string it returns true if not present then it returns false.

const text = “We love our country”;

console.log(text.includes(“our”));//true

console.log(text.includes(“unknown”));//false

3) String.prototype.toLowerCase()

This method returns the lower case format of the string

const text = “We love our country”;

console.log(text.toLowerCase()); //we love our country