Training Guide: Programming in HTML5 with JavaScript and CSS3 Ebook

308 CHAPTER 6 Essential JavaScript and jQuery

Answers

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

Lesson 1

1. Correct answer: C
   A. Incorrect: A property is a variable that’s defined on an object.
   B. Incorrect: A method is a function that’s defined on an object.
   C. Correct: A class is a blueprint for an object.
   D. Incorrect: An event takes place from external input, usually from user input.


2. Correct answer: A
   A. Correct: The prototype is the starting object that is cloned when creating a new
   object.
   B. Incorrect: A property is a variable that’s defined on an object.
   C. Incorrect: A class is a blueprint for an object.
   D. Incorrect: An event takes place from external input, usually from user input.


3. Correct answer: A
   A. Correct: You replace the prototype of the child object with a new instance of
   the parent object and then replace the prototype constructor with the child
   constructor.
   B. Incorrect: The createChild method is not a valid method.
   C. Incorrect: The setParent method is not a valid method.
   D. Incorrect: JavaScript does support inheritance by replacing the prototype of the
   child object with a new instance of the parent object and then replacing the proto-
   type constructor with the child constructor.

Lesson 2

1. Correct answer: B
   A. Incorrect: The use of the hash (#) symbol in the CSS selector indicates that you
   want to locate an element based on its id.
   B. Correct: The use of the period (.) in the CSS selector indicates that you want to
   locate the elements that match the CSS class name.
   C. Incorrect: Supplying a name for a CSS selector indicates that you want to locate
   the elements that have that tag name.
   D. Incorrect: The var hidden = $(‘class=Hidden’); syntax is invalid.