April 2018
Intermediate to advanced
284 pages
5h 46m
English
Content preview from Simplifying JavaScript
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| Tip 13 | Update Key-Value Data Clearly with Maps |
In this tip, you’ll learn how to use the Map object for key-value collections of frequently updated data.
In Tip 10, Use Objects for Static Key-Value Lookups , you learned that you should only use objects deliberately and not as a default collection. Now you’re going to get a chance to look at an alternative: Map.
Map is a special kind of collection that can do certain things very easily. The Mozilla Developer Network has a nice list of circumstances where Map is a better option for a collection than a plain object.[13] I encourage you to read the full list, but this tip examines two specific situations:
- Key-value pairs are frequently added or removed.
- A key isn’t a string.
In the next tip, you’ll ...
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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.