Add support to restrict to('best') to input measurement system

[mebeingken]

Thanks for your consideration...

Currently

convert(16, 'tablespoon').to('best')

results in 236.5882365 mL, which is accurate but perhaps not the best option as 16 tablespoons = 1 cup.

It would great if the best option could be restricted to the measurement system of the input.

Or perhaps I have missed how to do that today?

[jonahsnider]

That would be a good feature to add. The reason this doesn't happen currently is because internally tablespoons and milliliters are treated as the same unit family (volume).

Would changing the function like this be good?

// Automatic
convert(16, 'tablespoon').to('best'); // 1 cup
convert(0.5, 'liters').to('best'); // 500 mL

// Choose
convert(16, 'tablespoon').to('best', 'metric'); // 236 mL
convert(16, 'tablespoon').to('best', 'imperial'); // 1 cup

[mebeingken]

That implementation looks great to me!

[mebeingken]

@jonahsnider thanks for considering this new feature...for my planning, would this be something coming soon, or more like weeks away?

[jonahsnider]

I can probably release a working version of this in the next few days. The reason it's taken this long is because of difficulties I had in (premature) optimizations for bundle size & speed.

[jonahsnider]

Unfortunately I still haven't had a chance to make much progress on this feature, I'm not sure when I'll be able to get it in a usable state ready for release. If it's very important for you to have this functionality I'd suggest switching to a different library until I can get this finished (and I will get it finished eventually, I promise!).

[mebeingken]

Thanks for the update Jonah. I'm waiting for yours for now. I haven't found the right combination in other libraries that handles the "best" uom, and is available as UMD...which is likely more due to my skills than availability. 😄

[jonahsnider]

Finally got to finishing this and it's been released in v4.1.0 (the CI/CD bot should have announced that here but it got ratelimited).
The only limitation is that the input measurement system can't be inferred, instead it will default to metric. See the readme for usage examples.

[dRoskar]

Hello, is there a way to differentiate between US imperial and UK imperial here?

[jonahsnider]

Hello, is there a way to differentiate between US imperial and UK imperial here?

Please use #676 or create a new issue