Module: Enumerable

Included in:
Enumerating::Concatenator, Enumerating::Filter, Enumerating::Merger, Enumerating::Prefetcher, Enumerating::Zipper
Defined in:
lib/enumerating/filtering.rb,
lib/enumerating/threading.rb,
lib/enumerating/prefetching.rb

Instance Method Summary collapse

Instance Method Details

#[](n) ⇒ Object 



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# File 'lib/enumerating/filtering.rb', line 114

def [](n)
  dropping(n).first
end

#collecting ⇒ Object Also known as: mapping 



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# File 'lib/enumerating/filtering.rb', line 29

def collecting
  Enumerating::Filter.new do |output|
    each do |element|
      output.call yield(element)
    end
  end
end

#dropping(n) ⇒ Object 



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# File 'lib/enumerating/filtering.rb', line 95

def dropping(n)
  Enumerating::Filter.new do |output|
    each_with_index do |element, index|
      next if index < n
      output.call(element)
    end
  end
end

#dropping_while ⇒ Object 



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# File 'lib/enumerating/filtering.rb', line 104

def dropping_while
  Enumerating::Filter.new do |output|
    taking = false
    each do |element|
      taking ||= !yield(element)
      output.call(element) if taking
    end
  end
end

#prefetching(size) ⇒ Object 



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# File 'lib/enumerating/prefetching.rb', line 37

def prefetching(size)
  Enumerating::Prefetcher.new(self, size)
end

#rejecting ⇒ Object 



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# File 'lib/enumerating/filtering.rb', line 49

def rejecting
  Enumerating::Filter.new do |output|
    each do |element|
      output.call(element) unless yield(element)
    end
  end
end

#selecting ⇒ Object Also known as: finding_all 



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# File 'lib/enumerating/filtering.rb', line 39

def selecting
  Enumerating::Filter.new do |output|
    each do |element|
      output.call(element) if yield(element)
    end
  end
end

#taking(n) ⇒ Object 



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# File 'lib/enumerating/filtering.rb', line 75

def taking(n)
  Enumerating::Filter.new do |output|
    if n > 0
      each_with_index do |element, index|
        output.call(element)
        throw Enumerating::Filter::DONE if index + 1 == n
      end
    end
  end
end

#taking_while ⇒ Object 



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# File 'lib/enumerating/filtering.rb', line 86

def taking_while
  Enumerating::Filter.new do |output|
    each do |element|
      throw Enumerating::Filter::DONE unless yield(element)
      output.call(element)
    end
  end
end

#threading(max_threads, &block) ⇒ Object 



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# File 'lib/enumerating/threading.rb', line 6

def threading(max_threads, &block)
  collecting do |item|
    Thread.new { block.call(item) }
  end.prefetching(max_threads - 1).collecting do |thread|
    thread.join; thread.value
  end
end

#uniqing ⇒ Object 



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# File 'lib/enumerating/filtering.rb', line 57

def uniqing
  Enumerating::Filter.new do |output|
    seen = Set.new
    each do |element|
      output.call(element) if seen.add?(element)
    end
  end
end

#uniqing_by ⇒ Object 



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# File 'lib/enumerating/filtering.rb', line 66

def uniqing_by
  Enumerating::Filter.new do |output|
    seen = Set.new
    each do |element|
      output.call(element) if seen.add?(yield element)
    end
  end
end