Module: Enumerable

Defined in:
lib/fat_core/enumerable.rb

Overview

Useful extensions to the core Enumerable module.

Instance Method Summary collapse

Instance Method Details

#each_with_flags ⇒ Object

Yield each item together with two booleans that indicate whether the item is the first or last item in the Enumerable.

('a'..'z').to_a.each with_flags do |letter, first, last|
 if first
   # do something special for 'a'
 elsif last
   # do something special for 'z'
 else
   # a middling item
 end
end


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# File 'lib/fat_core/enumerable.rb', line 17

def each_with_flags
  # Test for beginless range
  return if is_a?(Range) && self.begin.nil?

  last_k = size - 1
  each_with_index do |v, k|
    first = k.zero?
    last  = (k == last_k)
    yield(v, first, last)
  end
end