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I was thinking of a sparse array but any name will do. obj[~42] ?

One may have a bunch of key ranges each associated with a value or one may have a key that should be "rounded" to the nearest key or retreave the one below or above it.

It feels like something basic enough to have in a language and I found it oddly complicated to write myself. Comparing it with all values doesn't seem like a very good solution.

Not that I know many languages.



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