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class Numeric
  def add(n)
    self + n
  end

  def subtract(n)
    self-n
  end

  def multiply_by(n)

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module Calculator
  def add(n)
    self + n
  end

  def subtract(n)
    self-n
  end

  def multiply_by(n)

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module InWords
  def in_words()
    ones_array = %w{ not_called one two three four five six seven eight nine ten}
    tens_array = %w{ not_called not_called twenty thirty forty fifty sixty seventy eighty ninety}
    teens_array = [ "" ] + %w{ one two three four five six seven eight nine ten eleven twelve thirteen fourteen fifteen sixteen seventeen eighteen nineteen}

    if self == 0
      return "zero"
    end

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def greeter(first, last)
  name = first + last
  if %w{ ShereefBishay TonyPhillips AnneSpalding }.include? name
    "I love Dev Bootcamp!"
  elsif %w{ JesseFarmer RobertFletcher }.include? name
    "Will you look at the C source code for this with me?"
  else
    "Well hello there."
  end
end

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def leap_year?(yr)
  yr % 4 == 0 && ( yr % 100 != 0 || yr % 400 == 0 )
end

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<h3>Numbers</h3>
<h4 class="gray">Addition, Subtraction, Multiplication</h4>
<h4 class="gray" >Division, Integers, And Floats</h4>
<h4 class="gray" >Variables</h4>
<h4 class="gray" >Arithmetic On Variables</h4>
<br />
<h3>Methods</h3>
<h4 class="gray" >Methods Definition</h4>
<h4 class="gray" >Arguments</h4>
<h4 class="gray" >Method Chaining</h4>

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def one_more(ar)
  ar << ar.last
end

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def sum(ar)
  ar.inject(0, :+)
end

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def title_case(str)
  str.split.map{ |el| el.capitalize }.join(" ")
end

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def triangle(n1,n2,n3)
  n1n2 = n1 == n2
  n2n3 = n2 == n3
  n1n3 = n1 == n3
  
  if n1 >= n2 + n3 || n2 >= n1 + n3 || n3 >= n1 + n2
    :invalid
  elsif n1n2 && n2n3 && n1n3
    :equilateral
  elsif n1n2 || n2n3 || n1n3