Tell us what’s happening:
The error message I keep getting is “bList.indexOf is not a function”. If I replace bList with booklist (which I shouldn’t do but it wouldn’t change the array, so whatever) then I get “bList.splice is not a function”. Somehow, the function runs perfectly fine with the global variable but it won’t run if I substitute my own. What gives?
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 (bList, bookName) {
return bList.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 (bList, bookName) {
if (bList.indexOf(bookName) >= 0) {
return bList.splice(0, 1, bookName);
// Add your 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 (X11; Linux x86_64; rv:52.9) Gecko/20100101 Goanna/4.1 Firefox/52.9 PaleMoon/28.0.0.
Link to the challenge:
https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/functional-programming/refactor-global-variables-out-of-functions/