How to list the unit type and respective aliases

[luzfcb]

Hello, what is the correct way to get an array of all MASS units that mathjs supports?
I'm developing a simple measure conversion application.

I want to show in a select the mass unit list for the user to select. I want to get them directly from MathJS. Is there any out-of-the-box way to do this in the MathJS API? If not, how would you do it?

[josdejong]

You can loop through all units defined in math.Unit.UNITS and filter those that have a base unit MASS, something like:

Object.values(math.Unit.UNITS).filter(unit => unit.base.key === 'MASS')

Note that each of the units can be prefixed too, like milligram and kilogram etc.