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 null object design pattern
Most object-oriented languages have a way of specifying the nonexistence of some value. In Scala and Java, for example, this could be the null value that can be assigned to an object. Calling any method on an object that is null would result in a NullPointerException, hence developers should be careful and check whether there is such a possibility. These checks, however, could make the source code hard to follow and extend as developers should always be aware. This is where the null object design pattern is helpful. Its purpose is:
Note
To define an actual object that represents the null value and has neutral behavior.
Using null objects removes the need to check whether something is set to null or not. The code becomes ...
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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.