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 / com
www.crowdersoftware.com
On Feb 4, 3:14 pm, RK <[email protected]> wrote:
> How would you check if a function is defined using prototype
>
> Thanks,
> RK.
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