Class: Array

Inherits:
Object
  • Object
show all
Defined in:
lib/scrambler/core_ext.rb

Overview

borrowed from activesupport

Instance Method Summary collapse

Instance Method Details

#sample(n = nil) ⇒ Object 



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# File 'lib/scrambler/core_ext.rb', line 3

def sample(n=nil)
  return self[Kernel.rand(size)] if n.nil?
  n = n.to_int
rescue Exception => e
  raise TypeError, "Coercion error: #{n.inspect}.to_int => Integer failed:\n(#{e.message})"
else
  raise TypeError, "Coercion error: obj.to_int did NOT return an Integer (was #{n.class})" unless n.kind_of? Integer
  raise ArgumentError, "negative array size" if n < 0
  n = size if n > size
  result = Array.new(self)
  n.times do |i|
    r = i + Kernel.rand(size - i)
    result[i], result[r] = result[r], result[i]
  end
  result[n..size] = []
  result
end