June 2007
Intermediate to advanced
294 pages
8h 6m
English
Content preview from Ruby by ExampleBecome 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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Using irb
Now that you’ve started it, irb is waiting for you to type your first line. Lines consist of one or more expressions.
Expressions
As far as Ruby is concerned, an expression is just a bit of code that has a value. In fine computer programming tradition, let’s see how irb reacts to the expression “Hello, world!”
irb(main):001:0> "Hello, world!" => "Hello, world!"
Note
This listing shows the line you need to type as well as how irb responds. Note also that irb shows you line numbers at the beginning of each line. I will occasionally refer to these numbers, as well.
What has happened here? You typed “Hello, world!”, and irb happily spat it right back at you. The interesting part of this is what isn’t explicit. The expression you entered has a ...
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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.