argSnifferSmackdown.js

var max = 1000000
  , fn = function fn(a,b,c,d,e){}
  , jedTime
  , higginsTime
  , t = new Date;

for ( var i = max; i--; ) schmidt( fn );

jedTime = new Date - t;
t = new Date;

for ( var i = max; i--; ) higgins( fn );
higginsTime = new Date - t;

console.log( "schmidt: " + jedTime );
console.log( "higgins: " + higginsTime );

// schmidt: 3384
// higgins: 2001

function schmidt( fn ) {
  return fn
    .toString()
    .split( /[^\w$]+/, fn.length + !!fn.name + 1 )
    .slice( !!fn.name + 1 );
}

function higgins( fn ) {
  return fn
    .toString()
    .replace(/function\s+\(/, "")
    .split(")")[0]
    .split(",");
}