January 2017
Intermediate to advanced
420 pages
9h 25m
English
Content preview from Programming KotlinBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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hashCode and equals methods generated for you
Every type is derived from Any, which comes with a hashCode method declaration. This is the equivalent of a Java Object class hashCode method. This method is important when you want to place your instances in collections, such as a map.
An object's hash code allows algorithms and data structures to place the instances in buckets. Imagine you implement a phone book. You'll place any name that starts with A in the A section, any name that starts with B in the B section, and so on. This simple approach allows you to have faster lookups when searching for someone. This is how hash-based collections, such as HashMap and HashSet, are implemented.
When implementing the method, you need to adhere to a contract: ...
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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.