Why do .callee arguments degrade performance?

Question

An alternative to using arguments.calleeis simply the name of the function, as such:

// Snippet 1, using arguments.callee:
(function(){
    document.body.innerHTML += 'qwe';
    setTimeout(arguments.callee, 1);
})()

// Snippet 2, using naming:
(function f(){
    document.body.innerHTML += 'qwe';
    setTimeout(f, 1);
})()

What stops the JavaScript engine / compiler from automatically optimizing Snippet 1 in Snippet 2 above? Is there any inherent limitation?

• The MDN argument basically boils down to:

  .. arguments.calleesignificantly complicates optimization, for example, the embedding of functions, since it is necessary to provide a link to the un-inlined function, if access to arguments.callee.

  However, if we manually call this function and call it through this name, we already provide a link to this function and, thus, “impede optimizations such as nesting functions”.

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, arguments.callee?

Answer 1

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