Question

If I’m using a function from the Math module, such as log10, do I need to call Math.log10(number) or can I do number.log10?

Answer 1

Numbers have no log10 method available by default, but you can extend the Numeric class to add that functionality:

class Numeric

  def log10
    Math.log10 self
  end
end

10.log10
=> 1.0

If you just want to use the methods without having to write Math all the time, you could include Math, then you can call log10 directly:

class YourClass
  include Math

  def method n
    log10 n
  end
end

YourClass.new.method 10
=> 1.0