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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Leveraging the Laziness of Streams
In previous chapters we’ve seen the facilities that the Stream interface offers, but so far we haven’t discussed one of their most salient features—they’re really lazy, in a good way. The lazy evaluation of Streams is powerful. First, we don’t have to do anything special to derive their benefits. In fact, we’ve used them many times already! Second, they can postpone not just one, but a sequence of evaluations so that only the most essential parts of the logic are evaluated, and only when needed. Let’s look at how lazy Streams are and how we benefit from that.
Intermediate and Terminal Operations
Streams have two types of methods: intermediate and terminal, which work together. The secret behind their laziness ...
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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.