Please fill out these questions for all feature requests and bug reports. If you're requesting a feature, please let us know why this feature is important or useful, not just what it should do.
- JS functions are undefineds
- go to https://snap.berkeley.edu/snapsource/snap.html, drag a JS function into the first of a <is  a [number v]> block, test it with builtin values, drag a (join [undefined] >) block into the second, note that the last is the true one.
- It says that the type of a JS function is undefined
- it should add another type called JSfunction