September 2017
Intermediate to advanced
216 pages
6h 8m
English
Content preview from Mastering Immutable.js
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Ordered maps
An ordered map is just like a map except that the order in which items are added is preserved. This type of map behaves like a list, only instead of looking up values using numerical indexes, you can use any key you like:
import { OrderedMap } from 'immutable';const myOrderedMap = OrderedMap();console.log('OrderedMap', myOrderedMap instanceof OrderedMap);// -> OrderedMap 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.