Functional Programming - Refactor Global Variables Out of Functions

JavaScript
1

I don’t understand what it’s asking me to do.
I don’t know how to apply what it asked me to change.

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) {

  bookList.push(bookName);
  return bookList;
  
  // Change code above this line
}

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

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

    // Change code above this line
    }
}

Your browser information:

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Challenge: Functional Programming - Refactor Global Variables Out of Functions

Link to the challenge:

3

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