Functional Programming - Refactor Global Variables Out of Functions

JavaScript
1

Tell us what’s happening:
Describe your issue in detail here.
Could someone please explain to me why this is wrong
Your code so far

// The global variable
const 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(bookName) {
  let newBookList = bookList.slice()
  newBookList.push(bookName);
  return newBookList;
  
  // Change code above this line
}

// Change code below this line
function remove(bookName) {
  let newBookList = bookList.slice()
  const book_index = newBookList.indexOf(bookName);
  if (book_index >= 0) {

    newBookList.splice(book_index, 1);
    return newBookList;

    // Change code above this line
    }
}

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Challenge: Functional Programming - Refactor Global Variables Out of Functions

Link to the challenge:

2

Both functions still rely on the global variable. Instead they should use array of books, that’s passed to the function.

3

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