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ActiveSupport::CoreExtensions::Array::RandomAccess

Public Instance Methods

sample(n=nil) click to toggle source

Backport of Array#sample based on Marc-Andre Lafortune's github.com/marcandre/backports/

# File lib/active_support/core_ext/array/random_access.rb, line 22
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: #{n}.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

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