What does let newArr = […arr] do exactly?
**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(arr,bookName) {
let newArr = [...arr]
newArr.push(bookName);
return newArr;
// Change code above this line
}
// Change code below this line
function remove(arr,bookName) {
let newArr = [...arr]
const book_index = bookList.indexOf(bookName);
if (book_index >= 0) {
newArr.splice(book_index, 1);
return newArr;
// Change code above this line
}
}
console.log(add(bookList,"The vikings of Valhala"))
console.log(remove(bookList,"On The Electrodynamics of Moving Bodies"))
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Challenge: Refactor Global Variables Out of Functions
Link to the challenge: