In Lab, whichever input takes a collection of something (be it IEnumerable<>, IList<>, array, etc) can also take individual entries as input. For example, if your selector function takes an array of values and you have 3 nodes each providing a single entry into that array you can simply wire the first entry into the array input. The UI in the selector node will change to allow you to wire the next two entries into it. This is the same as if you first created an array from those three entries and then connected the array into the input.
Hope that makes sense. You can always make a script like:
float[] ToArray( float[] inputs ) {... }
but that kind of is redundant.
Marsel Khadiyev (Software Developer, EPHERE Inc.)