Training Guide: Programming in HTML5 with JavaScript and CSS3 Ebook

Answers CHAPTER 9 413

Answers

This section contains the answers to the lesson review questions in this chapter.

Lesson 1

1. Correct answer: A
   A. Correct: Use the pipe method to chain asynchronous operations because it pro-
   vides access to progress, failure, success, and complete.
   B. Incorrect: The done method executes code when completed but does not provide
   access to failure, progress, and complete.
   C. Incorrect: The resolve method indicates success but is not used for chaining.
   D. Incorrect: The always method executes on completion regardless of success or
   failure. This method does not provide access to progress, success, or failure.


2. Correct answer: C
   A. Incorrect: The resolve method resolves an existing promise object, but it doesn’t
   create a new resolved promise object.
   B. Incorrect: The done method executes code upon success of a promise object, but
   it does not create a resolved promise object.
   C. Correct: The $.when() method creates a resolved promise object.
   D. Incorrect: The $.Deferred() method creates an unresolved promise object.


3. Correct answer: A
   A. Correct: The done method executes code upon successful completion.
   B. Incorrect: The alway method executes code regardless of success or failure.
   C. Incorrect: The complete method does not exist.
   D. Incorrect: The success method does not exist.


4. Correct answer: B
   A. Incorrect: The progress method executes code when progress has changed; it does
   not to indicate a change in progress.
   B. Correct: The notify method indicates a change in progress.
   C. Incorrect: The done method executes code when completed but does not indicate
   a change in progress.
   D. Incorrect: The resolve method indicates success, not a change in progress.