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Hacky Polish Notation

  1. const f = (o, ...a) => eval(a.join(o));
  2.  
  3. const polish = eq => eval(
  4.     eq.replace(/\s+/g, ' ')
  5.       .replace(/(\))\s([0-9])/g, '$1,$2')
  6.       .replace(/([0-9]+)[^\)]/g, '$1,')
  7.       .replace(/\(\s?([\+\-\*\\/])/g, 'f(`$1`,')
  8.   );
  9.  
  10. console.log(polish('(* 2 2)'));
  11. console.log(polish('(* 2 2 (+ 3 2 1))'));
  12. console.log(polish('(- 10 3)'));
  13. console.log(polish('(/ (+ 10 10 (* 2 2)) 3)'));

Hacky way to parse polish notation. This uses regular expressions to transform polish notation into javascript that can be run with eval. Just a weird/fun idea…

// javascript // lisp // math // s-expressions // scheme

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