Sams Teach Yourself JavaScript in 24 Hours

Sams Teach Yourself JavaScript in 24 Hours

By Michael Moncur

Quiz

Test your knowledge of JavaScript strings and arrays by answering the following questions.

Questions

1:

If the string test contains the value The eagle has landed., what would be the value of test.length?

  1. 4
  2. 21
  3. The
A1:

b. The length of the string is 21 characters.

2:

Using the same example string, which of these statements would return the word eagle?

  1. test.substring(4,9)
  2. test.substring(5,9)
  3. test.substring("eagle")
A2:

a. The correct statement is test.substring(4,9). Remember that the indexes start with 0, and that the second index is non-inclusive.

3:

What does the join method of an array do?

  1. Allows a new member to join the array.
  2. Combines the array with another array.
  3. Combines the array's elements into a string.
A3:

c. The join method combines the array's elements into a string.

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