Module: MissingMath::Number

Included in:
Fixnum, Float, Integer
Defined in:
lib/missing_math.rb

Overview

Methods that can apply to all number object types

Instance Method Summary collapse

Instance Method Details

#append(n) ⇒ Object

Returns the number with a number added to the end of the number Example: 1234.append(5) => 12345

Parameters:

  • integer —

    n The number to append



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# File 'lib/missing_math.rb', line 27

def append(n)
  str = "#{self}#{n}"
  number_out(str)
end

#contains?(search) ⇒ Boolean

Checks if the number contains a digit sequence or regex Example 1: 12345.contains?(34) => true Example 2: 12345.contains?(/34/) => true

Parameters:

  • integer|regexp —

    search

Returns:

  • (Boolean) 


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# File 'lib/missing_math.rb', line 77

def contains?(search)
  if search.is_a? Regexp
    return self.to_s.scan(search).length > 0 ? true : false
  else
    return self.to_s.index(search.to_s) ? true : false
  end
end

#length ⇒ Object

Returns the number of digits in the number (if a float, decimal is excluded) Example: 12345.length => 5



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# File 'lib/missing_math.rb', line 7

def length
  str = self.to_s
  if str.index('.')
    str.length - 1
  elsif
    str.length
  end
end

#pop ⇒ Object

Returns the number with the last digit removed from the end of the number Similar to an Array#pop method Example: 12345.pop => 1234



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# File 'lib/missing_math.rb', line 43

def pop
  str = self.to_s[0..-2]
  number_out(str)
end

#prepend(n) ⇒ Object

Returns the number with a number added to the beginning of the number Example: 2345.prepend(1) => 12345

Parameters:

  • integer —

    n The number to prepend



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# File 'lib/missing_math.rb', line 19

def prepend(n)
  str = "#{n}#{self}"
  number_out(str)
end

#rotate(right = true) ⇒ Object

Returns the number with the first digit moved to the end Example 1: 12345.rotate => 23451 Example 2: 12345.rotate(false) => 51234

Parameters:

  • boolean —

    right Defaults to rotating right. Set to false to rotate left



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# File 'lib/missing_math.rb', line 62

def rotate(right=true)
  a = self.to_a
  if right
    a.push(a.shift)
  elsif !right
    a.unshift(a.pop)
  end
  str = a.join('')
  number_out(str)
end

#shift ⇒ Object

Returns the number with the first digit removed from the beginning of the number Similar to an Array#shift method Example: 12345.shift => 2345



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# File 'lib/missing_math.rb', line 35

def shift
  str = self.to_s[1..-1]
  number_out(str)
end

#substr(search) ⇒ Object

Returns a digit subset/substring of the current number with a 0-indexed integer or range Similar to a String object’s substring methods. Example 1: 12345.substr(2) => 3 Example 2: 12345.substr(0..2) => 123

Parameters:

  • integer|range —

    search The substring search to return



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# File 'lib/missing_math.rb', line 53

def substr(search)
  str = self.to_s[search]
  number_out(str)
end

#to_a ⇒ Object

Converts an number to an array of numbers. If a decimal number, the decimal will be a position in the array Example: 12345.to_a => [1, 2, 3, 4, 5]



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# File 'lib/missing_math.rb', line 87

def to_a
  self.to_s.split('').map do |n|
    matches = n.scan(/[0-9]/).length
    if matches > 0
      n.to_i
    else
      n
    end
  end
end