Merge pull request #2 from fielded/callbacks

callback functions

Author: freefony

javascript/books.js

@@ -61,4 +61,4 @@ var books = [
   },
 ]
 
-export default book
+export default books

javascript/callbacks.js

@@ -0,0 +1,21 @@
+import books from './books'
+
+const filterBooksWithTitleStartingWithA = (sortedBooks, callback) => {
+  let filteredBooks
+  /* filter logic here */
+  return callback(filteredBooks)
+}
+
+const sortBooksAlphabetically = (books, callback) => {
+  let sortedBooks
+  /* sorting logic books */
+  return callback(sortedBooks)
+}
+
+const getBooksAsync = (callback) => {
+  setTimeout((books) => {
+    callback(books, filterBooksWithTitleStartingWithA)
+  }, 2000)
+}
+
+getBooksAsync(sortBooksAlphabetically)