I think using f-strings should be the best practice nowadays

If it was it isn't anymore. I got mine working fine.

console.log uses JSON.stringify to output the contents of objects. JSON doesn't support functions, so it skips them.

It something weird with the console.log(). Please try something like for(var i in deps) {console.log(deps[i].toString())}

Is something wrong with the system?

{} is the output from:

var deps = {
  'dep1': function() { return 'this is dep1'; },
  'dep2': function() { return 'this is dep2'; },
  'dep3': function() { return 'this is dep3'; },
  'dep4': function() { return 'this is dep4'; }
};

console.log(deps);

If there's any functions in the object it removes them all for some reason..

Indeed; I tried to remove that two days ago when making wthit56's edits, but it appears the republish didn't complete. Now it is removed.

If giving integers in JavaScript 00 will be passed to the function as 0 and will result in 10 and not 20 as the example specifies unless I'm missing something...