01. Old Books - while - loops - ex

function oldBooks(input) {
    let book = input.shift();
    let libraryCapacity = Number(input.shift());

    let checkedBooks = 0;
    let isFound = false;

    while(checkedBooks <= libraryCapacity) {
        let currentBook = input.shift();

        if(currentBook === book) {
            console.log(`You checked ${checkedBooks} books and found it.`);
            isFound = true;
            break;
        }

        checkedBooks ++;
    }

    if(isFound === false){
    console.log("The book you search is not here!");
    console.log(`You checked ${libraryCapacity} books.`);
    }
}