February 2016
Intermediate to advanced
382 pages
8h 1m
English
Content preview from Scala Design PatternsBecome 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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The command design pattern
Sometimes in our applications, we might need to pass information to other objects about how to perform some action. Usually, this action will be executed at a later time based on some kind of event. The object that will execute our commands is called invoker, and it might not even be aware of the command it actually runs. It just knows about the interface, which means that it knows how to trigger the command. The command design pattern helps us to achieve what we said above. Its purpose is to:
Note
Encapsulate the information needed to perform an action at a later stage and pass this information to the object that will be running the actual code.
Usually, the command information will contain the object that owns the method, ...
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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.