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class Number {
  """
Number is a mixin-class for all number values (integer & floats for
now).
"""

  def upto: num {
    """
@num @Number@ to create an @Array@ up to.
@return @Array@ containing numbers from @self to @num.

Returns an Array with Numbers starting at @self and going up to @num.
Expects @num to be greater or equal to @self.
"""

    i = self
    arr = []
    while: { i <= num } do: {
      arr << i
      i = i + 1
    }
    arr
  }

  def upto: num do: block {
    """
@num Maximum @Number@ to call @block with.
@block A @Block@ that should be called with each @Number@ between @self and @num.
@return @self

Calls @block with each @Number@ between @self and @num.
Expects @num to be greater or equal to @self.
"""
    i = self
    while: { i <= num } do: {
      block call: [i]
      i = i + 1
    }
    self
  }

  def upto: num in_steps_of: steps do: block {
    """
@num Maximum @Number@ to call @block with.
@steps @Number@ of numbers to skip each step.
@block A @Block@ that should be called every @steps steps between @self and @num.
@return @self

Calls @block every @steps steps between @self and @num with the current @Number@.
Expects @num to be greater or equal to @self.
"""

    i = self
    while: { i <= num } do: {
      block call: [i]
      i = i + steps
    }
    self
  }

  def downto: num {
    """
@num @Number@ to create an @Array@ down to.
@return @Array@ containing numbers from @self down to @num.

Returns an Array with Numbers starting at @self and going down to @num.
Expects @num to be smaller or equal to @self.
"""

    i = self
    arr = []
    while: { i >= num } do: {
      arr << i
      i = i - 1
    }
    arr
  }

  def downto: num do: block {
    """
@num Minimum @Number@ to call @block with.
@block A @Block@ that should be called with each @Number@ between @self and @num.
@return @self

Calls @block with each @Number@ between @self and @num.
Expects @num to be smaller or equal to @self.
"""

    i = self
    while: { i >= num } do: {
      block call: [i]
      i = i - 1
    }
    self
  }

  def downto: num in_steps_of: steps do: block {
    """
@num Minimum @Number@ to call @block with.
@steps @Number@ of numbers to skip each step.
@block A @Block@ that should be called every @steps steps between @self and @num.
@return @self

Calls @block every @steps steps between @self and @num with the current @Number@.
Expects @num to be smaller or equal to @self.
"""

    i = self
    while: { i >= num } do: {
      block call: [i]
      i = i - steps
    }
    self
  }

  def squared {
    """
@return Squared value of @self.

Returns the square of a Number.
"""

    self * self
  }

  def doubled {
    """
@return Doubled value of @self.

Returns the double value of a Number.
"""

    self + self
  }

  def cubed {
    """
@return Cubed value of @self.

Returns the cubed value of a Number.
"""

    self ** 3
  }

  def abs {
    """
@return Absolute (positive) value of @self.

Returns the absolute (positive) value of a Number.
"""

    if: (self < 0) then: {
      self * -1
    } else: {
      self
    }
  }

  def negate {
    """
@return Negated value of @self.

Negates a Number (-1 becomes 1 and vice versa).
"""

    self * -1
  }

  def even? {
    """
@return @true, if @self is even, @false otherwise.

Indicates, if a Number is even.
"""

    modulo: 2 . == 0
  }

  def odd? {
    """
@return @true, if @self is odd, @false otherwise.

Indicates, if a Number is odd.
"""

    self even? not
  }

  def max: other {
    """
@return Maximum value of @self and @other.
"""

    if: (self < other) then: {
      other
    } else: {
      self
    }
  }

  def min: other {
    """
@return Minimum value of @self and @other.
"""

    if: (self < other) then: {
      self
    } else: {
      other
    }
  }

  def random {
    """
@return Random number between 0 and @self.

Returns a random number between 0 and @self.
"""

    rand(self)
  }
}
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