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Re: Cheap runtime asserts

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glathoud <glathoud@yahoo.fr> wrote:
> Yes, you are right. The goal is not to catch 100% of the mistakes, but
> to have a good chance to catch strategic mistakes earls (see my answer
> to Patricia). 
> 
> In the case you are describing, you could instead make sure that the
> data property is defined IF that is what you need: 
> 
> node.childNodes[0].data.a;

Ah, I see what you're trying to do. Nice trick.

But how to do it if a parameter of null and non-null are both accepted by 
a function? For example, a function to toggle (set/clear) an element's 
onclick handler.

function toggleHandler(ele, func) {
  ele.onclick.a;
  func.a;
  ele.onclick = ele.onclick ? null : func;
}
function dummy() {}
//below line would cause an exception.
//it's expected since document doesn't have onclick property
toggleHandler(document, dummy);
//but below line would also cause an exception.
//assuming that document.body.onclick is null before call
toggleHandler(document.body, dummy);

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Cheap runtime asserts glathoud <glathoud@yahoo.fr> - 2012-12-04 22:00 -0800
  Re: Cheap runtime asserts Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-12-05 20:18 +0100
    Re: Cheap runtime asserts glathoud <glathoud@yahoo.fr> - 2012-12-06 11:19 -0800
      Re: Cheap runtime asserts Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-12-06 23:41 +0100
  Re: Cheap runtime asserts Patricia Shanahan <pats@acm.org> - 2012-12-05 12:00 -0800
    Re: Cheap runtime asserts glathoud <glathoud@yahoo.fr> - 2012-12-06 11:34 -0800
  Re: Cheap runtime asserts JJ <jaejunks@glegooilma-swapit.com> - 2012-12-06 07:29 +0000
    Re: Cheap runtime asserts glathoud <glathoud@yahoo.fr> - 2012-12-06 11:40 -0800
      Re: Cheap runtime asserts JJ <jaejunks@glegooilma-swapit.com> - 2012-12-07 12:03 +0000
        Re: Cheap runtime asserts glathoud <glathoud@yahoo.fr> - 2012-12-10 23:46 -0800
  Re: Cheap runtime asserts Stefan Weiss <krewecherl@gmail.com> - 2012-12-06 23:00 +0100
    Re: Cheap runtime asserts glathoud <glathoud@yahoo.fr> - 2012-12-11 00:07 -0800

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