Refactor Global Variables Out of Functions #2

Tell us what’s happening:
I’ve cleared all the syntax errors, I didn’t modify the original code and yet the test won’t pass.

Your code so far
var bookList = [“The Hound of the Baskervilles”, “On The Electrodynamics of Moving Bodies”, “Philosophiæ Naturalis Principia Mathematica”, “Disquisitiones Arithmeticae”];

// Change code below this line
function add (list, bookName) {
return […list, bookName];

// Change code above this line
}

// Change code below this line
function remove (list, bookName) {
return list.filter(book <= book !== bookName);

// Change code above this line
}

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);


// The global variable
var bookList = ["The Hound of the Baskervilles", "On The Electrodynamics of Moving Bodies", "Philosophiæ Naturalis Principia Mathematica", "Disquisitiones Arithmeticae"];

// Change code below this line
function add (list, bookName) {
return [...list, bookName];


 
 // Change code above this line
}

// Change code below this line
function remove (list, bookName) {
return list.filter(book <= book !== bookName);

   // Change code above this line
   }


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);

Your browser information:

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.129 Safari/537.36 OPR/68.0.3618.112.

Challenge: Refactor Global Variables Out of Functions

Link to the challenge:

You have typo in return list.filter(book <= book !== bookName);, there is an arrow function in the filter, so it should be => instead of <=.