Answers CHAPTER 3 135
C. Incorrect: Microsoft Test does not support JavaScript.
D. Incorrect: NUnit does not support JavaScript.- Correct answer: B
A. Incorrect: You need to write a failing test first so you can see the test pass after
you write the code.
B. Correct: You write a failing test and then write code that makes the test pass; then
run the test again to validate that it passes.
C. Incorrect: You should never write code without first writing a test that fails.
D. Incorrect: If you write a passing test first, the code cannot be tested for success. - Correct answer: C
A. Incorrect: Placing your JavaScript code in the element does not promote
reuse, and inline code might reference elements that are not yet loaded.
B. Incorrect: Placing your JavaScript code in the tag does not promote
reuse.
C. Correct: Placing your JavaScript code in separate files, external to your HTML
document, promotes reuse.
D. Incorrect: Placing your JavaScript code in the element does not promote
reuse, and inline code might reference elements that are not yet loaded.
Lesson 3
- Correct answer: A
A. Correct: Concat concatenates multiple arrays and produces a resultant array.
B. Incorrect: Join creates a string from the items in the array.
C. Incorrect: Push adds a single item to the end of the array.
D. Incorrect: Splice adds and removes items from an array and produces a resultant
array, but you must add the items one by one, not as an array. - Correct answer: C
A. Incorrect: getElementsByName retrieves a live NodeList of elements based on the
element’s name attribute, not on the tag name.
B. Incorrect: querySelectorAll is capable of retrieving the elements by tag name, but
returns a static NodeList, which does not perform as well as functions that return a
live NodeList.
C. Correct: getElementsByTagName retrieves a live NodeList of elements based on
the element’s tag name.
D. Incorrect: getElementsByClass retrieves a live NodeList of elements based on the
CSS class name.