Union of numbers between range | TypeScript Community | Page 1

runic fiber Feb 17, 2023, 11:47 PM

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Trying to create a type that would look something like

type Result = UnionOfRange<0, 3>
//   ^? Results = 0 | 1 | 2 | 3

Any geniuses around to help me out?

brave quartz Feb 18, 2023, 2:35 AM

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type UpTo<N extends number, A extends number[] = []> =
  A['length'] extends N ? A[number] : UpTo<N, [...A, A['length']]>

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@runic fiber Might be possible to modify this to go from a different number than 0.

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Honestly this is just a snippet that floats around this server, might be able to find a more advanced version if you search around.

runic fiber Feb 18, 2023, 9:33 AM

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Thanks, that works great. no idea how it works though

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any clues?

#Union of numbers between range