Bug 32918 – setTimeout() & setInterval() should raise an exception if the first argument is not callable

• Status: NEW
• Component: WebCore JavaScript

[Andrey Kosyakov]

setTimeout() & setInterval() fail silently in case first argument is not a function or string. Other implementations (FF, IE) throw an exception.

setTimeout(function(){ alert('a') }, 10); // works as intended
setTimeout(10, function(){ alert('a') }); // makes no sense but no diagnostics provided

FF 3.5.6:
Error: useless setTimeout call (missing quotes around argument?)

IE 8.0:
Message: Invalid argument.