July 1998
Intermediate to advanced
1456 pages
65h 5m
English
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Name
typeof — NN 3 IE J1 ECMA 1
Synopsis
The typeof operator. This unary operator returns
one of six string descriptions of the data type of a value. Those
returned types are:
booleanfunctionnumberobjectstringundefined
The object type includes arrays, but the operator provides no further information about the type of object or array of the value.
Example
if (typeof someVar == "string") {
...
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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.