Question

Just wondering how to test that a prototype is available based on its name.

For instance:

var node = new window[className];   
console.log('test');

doesn’t print anything if the className provided doesn’t match a prototype that’s been made available.

So testing:

if(! window[className]) {...}

make nothing to happen, the execution just stops, no breakpoint available past that point.

How can I handle this case?
Thanks!

Answer 1

If you want something to happen when className is not available, just use a simple else statement:

if(! window[className]) {
   ...
} else {
   alert("No truthy property '"+className+"' was found on the window object");
   throw new Error("something bad happened");
   // whatever
}