Instead of doing this:
let copyBooks = [...books] <--- we used a copy of the array in our functions. copyBooks.push(bookName); return copyBooks ;
you could have also done this:
return books.concat([bookName]);
because the concat method doesn't change the existing array and returns a new array.
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Instead of doing this:
you could have also done this:
because the concat method doesn't change the existing array and returns a new array.