April 2018
Intermediate to advanced
284 pages
5h 46m
English
Content preview from Simplifying JavaScript
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| Tip 11 | Create Objects Without Mutations Using Object.assign() |
In this tip, you’ll learn how to update an object without mutations, using Object.assign().
In the previous tip, you took a quick look at objects and got rules for when they offer distinct advantages over other collections. Still, you need to be careful when using them because they can leave you open to the same problems with mutations and side effects that you saw in arrays. Casually adding and setting fields on objects can create unseen problems.
Consider a very common problem. You have an object with a number of key-values pairs. The problem is that the object is incomplete. This happens often when you have legacy data and there are new fields, or you are getting data from an ...
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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.