Module: StepSequencer::Refinements::StringRationalEval

Defined in:
lib/step_sequencer/refinements.rb

Overview

String#rational_eval

a method I’ve written to help work with rational numbers. It evals a string containing math, but wraps all number values in a call It raises an error if the result is not a rational

Instance Method Summary collapse

Instance Method Details

#rational_eval ⇒ Object 



58
59
60
61
62
63
64
65
 
# File 'lib/step_sequencer/refinements.rb', line 58

def rational_eval
  result = eval <<-RB
    Rational(#{
      gsub(/\d[\d\.\_]*/) { |str| "Rational(#{str})"}
    })
  RB
  result.is_a?(Rational) ? result : raise("#{result} is not Rational")
end