June 2014
Intermediate to advanced
696 pages
38h 52m
English
Content preview from Node.js, MongoDB, and AngularJS Web Development
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Checking Object Types
It is often useful to determine whether an object you have gotten back from a command is of a certain type. You can do this in a couple different ways. For example, one way is to use the isinstanceof operator, which compares the object types and returns true or false. For example:
([1,2,3] instance of Array) //true
The util module also provides the isArray(object), isRegExp(object), isDate(object), and isError(object) convenience methods to determine whether an object is an Array, RexExp, Date, or Error object. For example:
(util.isArray([1,2,3]) //true.
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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.