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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Side Effects in Functional Pipelines
A common mistake many programmers make is mutating shared variables from the functional pipeline. That’s a big no-no.
Purely functional programming languages, like Haskell, don’t permit mutability. The compilers of such languages will disallow writing code, let alone lambda expressions that mutate data. Java is a hybrid language and the functional programming capabilities were added almost two decades after the language was created. Thus, the compiler for the most part won’t complain if it finds impure lambda expressions—but we should.
A programmer once emailed me a snippet of code that had been working fine, but its behavior had become rather unpredictable after the most recent change they had made. They ...
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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.