Multiple choice technology programming languages

What is the output of the below JavaScript? 


var book = "Head First JavaScript";         
alert(book.length);

  1. 21

  2. 20

  3. 22

  4. error
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A Correct answer
Explanation

The length property returns the number of characters in the string. Counting all letters and spaces in "Head First JavaScript" yields a total of 21 characters.

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