September 2017
Intermediate to advanced
216 pages
6h 8m
English
Content preview from Mastering Immutable.js
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Adding duplicate values
Let's see what happens when we call printValues() when we try adding a duplicate value to myOrderedSet:
console.log('adding 3 again');printValues(myOrderedSet.add(Map.of('three', 3)));// -> adding 3 again
The side-effect doesn't run because the value that we're trying to add with add() isn't actually added since it's a duplicate of a value that's already in the set.
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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.