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![def fractal_flipflop
w, h = 44, 54
c = 7 + 42 * w
a = [0] * w * h
g = d = 0
f = proc do |n|
a[c] += 1
o = a.map {|z| " :#"[z, 1] * 2 }.join.scan(/.{#{w * 2}}/)
puts "f" + o.map {|l| l.rstrip }.join("n")
d += 1 - 2 * ((g ^= 1 << n) >> n)
c += [1, w, -1, -w][d %= 4]
end
1024.times do
!!(!!(!!(!!(!!(!!(!!(!!(!!(true...
f[0])...f[1])...f[2])...
f[3])...f[4])...f[5])...
f[6])...f[7])...f[8])
end
end](https://image.slidesharecdn.com/aloharubyconf2012-jruby-121008214054-phpapp02/85/Aloha-RubyConf-2012-JRuby-11-320.jpg)
- 12 / 110
![def fractal_flipflop
w, h = 44, 54
c = 7 + 42 * w
a = [0] * w * h
g = d = 0
f = proc do |n|
a[c] += 1
o = a.map {|z| " :#"[z, 1] * 2 }.join.scan(/.{#{w * 2}}/)
puts "f" + o.map {|l| l.rstrip }.join("n")
d += 1 - 2 * ((g ^= 1 << n) >> n)
c += [1, w, -1, -w][d %= 4]
end
1024.times do
!!(!!(!!(!!(!!(!!(!!(!!(!!(true...
f[0])...f[1])...f[2])...
f[3])...f[4])...f[5])...
f[6])...f[7])...f[8])
end
end](https://image.slidesharecdn.com/aloharubyconf2012-jruby-121008214054-phpapp02/85/Aloha-RubyConf-2012-JRuby-12-320.jpg)
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![turtle("four-sided triangle") do |*args|
dim = (args[0] || 5).to_i
block_type = (args[1] || :stone).to_sym
layer do
4.times do |i|
forward dim
turnleft 90
end
end
pivot do
block :none
forward 1
turnleft 90
forward 1
turnup 90
forward 1
turndown 90
turnright 90
block block_type
end
block block_type
(1...dim).step(2).to_a.reverse.each do |i|
dim = i
layer
pivot
end
end](https://image.slidesharecdn.com/aloharubyconf2012-jruby-121008214054-phpapp02/85/Aloha-RubyConf-2012-JRuby-47-320.jpg)
![10.times do
old_ary = []
10000.times do
old_ary << 'foo'
new_ary = []
100000.times do
new_ary << 'bar'
end
end
puts "looped"
end](https://image.slidesharecdn.com/aloharubyconf2012-jruby-121008214054-phpapp02/85/Aloha-RubyConf-2012-JRuby-61-320.jpg)
![Profiling
• Java profilers
• VisualVM,YourKit, NetBeans, JXInsight
• jruby [--profile | --profile.graph]
• jruby -Xreify.classes=true
• JVM command-line profilers](https://image.slidesharecdn.com/aloharubyconf2012-jruby-121008214054-phpapp02/85/Aloha-RubyConf-2012-JRuby-79-320.jpg)
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Uploaded byCharles Nutter
Aloha RubyConf 2012 - JRuby
JRuby is a Ruby implementation that runs on the Java Virtual Machine (JVM). It allows Ruby code to leverage Java libraries and frameworks and enables deployment on JVM platforms like Android. The JRuby team maintains and improves JRuby, but much of the underlying infrastructure like memory management, threading, and JIT compilation is provided by the JVM, allowing the team to focus on Ruby-specific aspects. JRuby can be used on many platforms and provides access to Java libraries and frameworks, enabling applications to leverage large Java ecosystems.
