September 2015
Intermediate to advanced
250 pages
6h 40m
English
Content preview from Pragmatic Scala
Become 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,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.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.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.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.
Value Classes
Code like 2 days ago is charming, but what’s the catch? Let’s take a look under the hood to see what the Scala compiler actually did to that expression. Compile the file DateUtil.scala using scalac and run javap -c UseDateUtil\$, the shadow inner class that Scala created for the singleton, and quickly search for the call to the days method. Let’s examine a few lines of bytecode around the method call:
| | 5: invokevirtual #73 // Method |
| | DateUtil$.DateHelper:(I)LDateUtil$DateHelper; |
| | 8: getstatic #69 // Field |
| | DateUtil$.MODULE$:LDateUtil$; |
| | 11: invokevirtual #77 // Method |
| | DateUtil$.ago:()Ljava/lang/String; |
| | 14: invokevirtual #83 // Method |
| | DateUtil$DateHelper.days:(Ljava/lang/String;)Ljava/time/LocalDate; |
Here’s the cost of the ...
Become 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,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.