November 2001
Intermediate to advanced
218 pages
6h 22m
English
Content preview from Ruby in a NutshellBecome 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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Tracer
When you want to trace the entrance and
exit of each method, tracer is the tool for you.
In order to add method call/return tracing to your Ruby program, load
the Tracer library using the command-line option
-r tracer. Here is sample output from
tracer:
% ruby -r tracer fact.rb 2 #0:fact.rb:1::-: def fact(n) #0:fact.rb:1:Module:>: def fact(n) #0:fact.rb:1:Module:<: def fact(n) #0:fact.rb:10::-: print fact(ARGV[0].to_i), "\n" #0:fact.rb:10:Array:>: print fact(ARGV[0].to_i), "\n" #0:fact.rb:10:Array:<: print fact(ARGV[0].to_i), "\n" #0:fact.rb:10:String:>: print fact(ARGV[0].to_i), "\n" #0:fact.rb:10:String:<: print fact(ARGV[0].to_i), "\n" #0:fact.rb:1:Object:>: def fact(n) #0:fact.rb:2:Object:-: return 1 if n == 0 #0:fact.rb:2:Fixnum:>: return 1 if n == 0 #0:fact.rb:2:Fixnum:<: return 1 if n == 0 #0:fact.rb:3:Object:-: f = 1 #0:fact.rb:4:Object:-: while n>0 #0:fact.rb:4:Fixnum:>: while n>0 #0:fact.rb:4:Fixnum:<: while n>0 #0:fact.rb:5:Object:-: f *= n #0:fact.rb:5:Fixnum:>: f *= n #0:fact.rb:5:Fixnum:<: f *= n #0:fact.rb:6:Object:-: n -= 1 #0:fact.rb:6:Fixnum:>: n -= 1 #0:fact.rb:6:Fixnum:<: n -= 1 #0:fact.rb:6:Fixnum:>: n -= 1 #0:fact.rb:6:Fixnum:<: n -= 1 #0:fact.rb:5:Object:-: f *= n #0:fact.rb:5:Fixnum:>: f *= n #0:fact.rb:5:Fixnum:<: f *= n #0:fact.rb:6:Object:-: n -= 1 #0:fact.rb:6:Fixnum:>: n -= 1 #0:fact.rb:6:Fixnum:<: n -= 1 #0:fact.rb:6:Fixnum:>: n -= 1 #0:fact.rb:6:Fixnum:<: n -= 1 #0:fact.rb:8:Object:-: return f #0:fact.rb:8:Object:<: return f #0:fact.rb:10:Kernel:>: ...
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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.