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there are instanced where i expect the file_extension to be "undefined" - but my condition doesn't appear to work. also tried typeof(file_extension) === "undefined"

what are you trying to do?
```file_extension !== null```
should render
```typeof file_extension === "undefined"```
unnecessary. undefined is not equal to null

Also, `undefined` is not a string, it's a primitive value

If you expect `file_extension` to not be there some times, then `if (file_extension)` should be sufficient

`null` , `undefined`, `""`, `0`, `false`, `NaN` will *all* evaluate to `false` in a Boolean context: <https://developer.mozilla.org/en-US/docs/Glossary/Falsy>

sorry I missed your `typeof`s, but this ^ still applies

I've rarely found the need to check explicitly for `undefined` and *not* the other empty values

It was meant to be typeof file_extension !== "undefined" - anyway, if(file_extension) worked, I thought it was not working previously hence why I was aiming to check for undefined. All good, thanks