The errorMessages are explicitly given!

•  "Return statements are only valid inside functions"

  I explained this already

•  "Can't find variable: leg"

  so my proposal doesnt fail it's your JS Code. Either you can't access the namespace of leg or you misspelled it.

  Though you may want to try window.leg or play around inside your browser's JS console (normally type F12 to get there)

HINT: var denotes a lexical var inside a function°, it only becomes global* if used outside.

updates

°) mostly like my in Perl except for the hoisting effect

*) in this case it behaves mostly like our in Perl

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