On Feb 5, 5:31 pm, "T.J. Crowder" <t...@crowdersoftware.com> wrote:
> Hi,
>
> If the function is expected as a property of some object (including
> `window`), then I'd probably do this:
>
> if (typeof obj.functionName == 'function')
>
> So for instance:
>
> if (typeof window.globalEval == 'function')
>
> If you need to check whether a function is defined in the current
> scope and not on a property (so, on the current variable object or one
> of the others in the scope chain), I'd probably be a bit more
> defensive:
>
> var defined = false;
> try {
> defined = typeof functionName == 'function';
> }
> catch (e) {
> }
>
> Prototype also adds a function to `Object` that does the check:
>
> if (Object.isFunction(window.globalEval))
>
> ...which is just a shorthand way of doing the typeof.
>
> HTH,
> --
> T.J. Crowder
> Independent Software Consultant
> tj / crowder software / comwww.crowdersoftware.com
>
> On Feb 4, 3:14 pm, RK <rajkishore.puj...@gmail.com> wrote:
>
> > How would you check if a function is defined using prototype
>
> > Thanks,
> > RK.
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