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urokuta/simple_calc.rb

Last active August 29, 2015 14:01
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simple_calc
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simple_calc.rb
def expr(e) e.to_s.include?("=") ? e.split[0..-2].inject([]){|arr,e| (!arr.empty? && arr.last =~ /[^\d]/) ? [eval([*arr,e].join)] : arr << e } : ->(_e){expr("#{e} #{_e}")} end
puts expr(4)["+"][3]["*"][2]["-"][1]["="]
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urokuta commented May 10, 2014 

ruby -e 'def f(e)e.to_s.include?("=")?e.split[0..-2].inject([]){|a,e|(!a.empty?&&a[-1]=~/[^\d]/)?[eval([*a,e].join)]:a<<e}:->(b){f("#{e} #{b}")}end;puts f(4)["+"][3]["*"][2]["-"][1]["="]'

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