August 2006
Intermediate to advanced
1018 pages
34h 13m
English
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Name
NaN: the not-a-number property — ECMAScript v1
Synopsis
NaN
Description
NaN is a global property
that refers to the special numeric not-a-number value. The NaN property is not enumerated by for/in loops and cannot be deleted with
the delete operator. Note that
NaN is not a constant and can be
set to any other value, something that you should take care not to
do.
To determine if a value is not a number, use isNaN( ), because NaN always compares as nonequal to any
other value, including itself!
See Also
Infinity, isNaN( ), Number.NaN
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.