What is Ruby?
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Ruby is an object-oriented programming language where everything is an object. It supports concepts like single inheritance with mixins, duck typing, metaprogramming and concise yet powerful syntax. The document provides examples of an elegant quicksort implementation, a concise filename incrementer method, and a powerful method to traverse a tree structure and yield output.
![Elegant
def
quicksort(a)
return
a
if
a.length
<=
1
pivot
=
a.shift
split
=
a.partition
{|i|
i
<
pivot}
(quicksort(split[0])
<<
pivot
<<
(quicksort(split[1]))).flatten
end](https://image.slidesharecdn.com/ruby-presentation-140521121302-phpapp01/85/What-is-Ruby-3-320.jpg)
![Concise
def
fname_incr(fname)
!File.exists?(fname)
?
fname
:
/([0-‐9]+)./.match(fname)
?
fname_incr(fname.sub(/([0-‐9]+)/)
{
|m|
(m.to_i+1).to_s
})
:
fname_incr(fname.sub(/[^.]*/)
{
|m|
m+'1'
})
end](https://image.slidesharecdn.com/ruby-presentation-140521121302-phpapp01/85/What-is-Ruby-4-320.jpg)
What is Ruby?
- 1. Ruby
- 2. Facets of Ruby • Object-‐Oriented to the core – Everything is an object – Tight encapsula<on – Single Inheritance, but with mixin magic • Dynamic – Duck typing – Advanced metaprogramming
- 3. Elegant def quicksort(a) return a if a.length <= 1 pivot = a.shift split = a.partition {|i| i < pivot} (quicksort(split[0]) << pivot << (quicksort(split[1]))).flatten end
- 4. Concise def fname_incr(fname) !File.exists?(fname) ? fname : /([0-‐9]+)./.match(fname) ? fname_incr(fname.sub(/([0-‐9]+)/) { |m| (m.to_i+1).to_s }) : fname_incr(fname.sub(/[^.]*/) { |m| m+'1' }) end
- 5. Powerful def traverse_tree(addition = '', &proc) yield addition + "Q: #{self.value}" depth = $total_height -‐ self.height # add 1 to depth because the root node has a depth of 0 self.yes.traverse_tree("n"+"t"*(depth+1), &proc) self.no.traverse_tree("n"+"t"*(depth+1), &proc) end