May 2001
Intermediate to advanced
720 pages
23h 24m
English
Content preview from ActionScript: The Definitive GuideBecome 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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Null
Intellectually, the null type is
nearly identical to the undefined type. Like the
undefined datatype, the
null datatype is used to represent a lack of
data and has only one legal value, the primitive value
null. The null value is not
assigned by the interpreter automatically, but rather by us
deliberately.
We assign null to a variable, array element, or
object property to indicate that the specified data container does
not contain a legal number, string, boolean, array, or object value.
Note that null only compares equal to itself and
undefined:
null == undefined; // true null == null; // true
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.