"Addition of Regexps" is invalid

[towc]

The code presented is

// Patch a toString method
RegExp.prototype.toString =
  function() {
    return this.source;
  } /
  7 /
  -/5/; // -> 2

But when running, that's just NaN because it divides a function by 7.

What you probably meant is:

// Patch a toString method
RegExp.prototype.toString =
  function() {
    return this.source;
  };
/7/ - /5/; // -> 2

[towc]

also, can I suggest you use --> 2 and similar for all the comments meant to show the return value, instead of the standard //? Would add to the quirky experience

[denysdovhan]

This is probably broken because of Prettier :\

[denysdovhan]

Already fixed. Thanks for reporting!