January 2024
Intermediate to advanced
718 pages
20h 15m
English
Content preview from Programming Ruby 3.3Become 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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Blocks, Closures, and Proc Objects
A code block is a set of Ruby statements and expressions inside braces or a do/end pair. The block may start with an argument list between vertical bars. A code block may appear only immediately after a method invocation. The start of the block (the brace or the do) must be on the same logical source line as the end of the invocation:
invocation do | a1, a2, ... |
end
invocation { | a1, a2, ... |
}
Braces have a high precedence; do has a low precedence. If the method invocation has parameters that aren’t enclosed in parentheses, the brace form of a block will bind to the last parameter, not to the overall invocation. The do form will bind to the entire invocation.
Within the body of the invoked method, the ...
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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.
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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.