case-convert.js

const userName = 'Farhana';
const userInput = 'farhaNa';
if(userName.toLowerCase() == userInput.toLowerCase()){
    console.log(userInput);
}

/* const userInput = 'blackPinK';
const namePro ='blackpink';
// console.log(namePro.toUpperCase());
if(userInput.toUpperCase() == namePro.toUpperCase()){
    console.log('user exists');
} */