July 2023
Intermediate to advanced
276 pages
6h 55m
English
Content preview from Functional Programming in Java, 2nd EditionBecome 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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Chapter 9Composing Functions with Lambda Expressions
With Java we have two powerful tools: the object-oriented approach and the functional style. They aren’t mutually exclusive; they can work together for the greater good.
In OOP we often mutate state. If we combine OOP with the functional style, we can instead transform objects by passing lightweight objects through a series of cohesive functions. This can help us create code that’s easier to extend—to produce a different result we simply alter the way the functions are composed. We can use the functions, in addition to the objects, as components to program with.
In this chapter we look into function composition. Then we use that to create a practical working example of the popular MapReduce ...
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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.