JavaScript syntax: Difference between revisions

Revision as of 10:45, 26 June 2015

Revision as of 10:46, 26 June 2015

Line 163:

Unlike undefined, [[Null Object pattern|null]] is often set to indicate that something has been declared, but has been defined to be empty. In a Boolean context, the value of null is considered a false value in JavaScript.

Note: Null is a true primitive-type within the JavaScript language, of which <tt>{{mono|null</tt>}} (note case) is the single value. As such, when performing checks that enforce type checking, the null value will not equal other false types. Surprisingly, <tt>{{mono|null</tt>}} is considered an object by <tt>{{mono|typeof</tt>}}.

<syntaxhighlight lang=JavaScript>