September 2015
Intermediate to advanced
92 pages
1h 30m
English
Content preview from JavaScript Quick Syntax ReferenceBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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CHAPTER 6
Conditionals
Conditional statements are used to execute different code blocks based on different conditions.
If Statement
The if statement only executes if the expression inside the parentheses is evaluated to true. In JavaScript, this does not have to be a Boolean expression. It can be any expression, in which case zero, null, NaN, empty strings, and undefined variables are evaluated as false, and all other values are true.
if (x < 1) { document.write("x < 1");}
To test for other conditions, the if statement can be extended by any number of else if clauses. Each additional condition will only be tested if the preceding conditions ...
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