Tell us what’s happening:
I don’t get why my code fails (2 and 4 checks) for the add function… whereas it worked on on JSBIN : https://jsbin.com/hagicuramu/edit?js,console,output
Your code so far
// the global variable
var bookList = ["The Hound of the Baskervilles", "On The Electrodynamics of Moving Bodies", "Philosophiæ Naturalis Principia Mathematica", "Disquisitiones Arithmeticae"];
/* This function should add a book to the list and return the list */
// New parameters should come before the bookName one
// Add your code below this line
function add (bookList, bookName) {
return [...bookList].push(bookName);
// Add your code above this line
}
/* This function should remove a book from the list and return the list */
// New parameters should come before the bookName one
// Add your code below this line
function remove (bookList, bookName) {
let list = [...bookList];
if (list.indexOf(bookName) >= 0) {
list.splice(list.indexOf(bookName), 1);
return list;
// Add your code above this line
}
return list;
}
var newBookList = add(bookList, 'A Brief History of Time');
var newerBookList = remove(bookList, 'On The Electrodynamics of Moving Bodies');
var newestBookList = remove(add(bookList, 'A Brief History of Time'), 'On The Electrodynamics of Moving Bodies');
console.log(bookList);
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Link to the challenge:
https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/functional-programming/refactor-global-variables-out-of-functions