Re: What is the faster way to determine if nsIDOMNSHTMLElement is an anchor

On 5/22/10 9:46 AM, n179911 wrote:
> Can you please tell me which is a faster way (run time performance) to
> determine if nsIDOMNSHTMLElement is an anchor?

Depends on how you define "anchor".

> nsIDOMNSHTMLElement* element;
>   nsCOMPtr<nsIDOMNSHTMLAnchorElement>  anchorElement =
> do_QueryInterface(element);
>   if (anchorElement) {
>    // it is an anchor element....
> }
> or
> nsIDOMNSHTMLElement element;
>   nsAutoString name;
>     childNode->GetNodeName(name);
>   if (name.LowerCaseEqualsLiteral("a")) {
>   // it is an anchor elemlent....

Which of these is faster will likely depend on your compiler, 32-bit vs 
64-bit, etc, etc.  They're both fundamentally "slow", but any way that 
only uses frozen APIs probably is.

You could make the second test a localName test to slightly speed it up, 
I guess.

-Boris