category feedThe records problemMiscellaneouseditdelete

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      lens (Hackage)
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      lens is commonly used to make working with records easier (though it doesn't provide everything that we might want from a records system). Things that are possible with lens:

      • Updating records: set a field with field .~ x, apply a function to a field with field %~ f.
      • Updating nested records: just chain field names like foo.bar.baz %~ f.
      • Having several records with the same field name: see makeFields.
      • “Subtyping”, i.e. being able to say that a record is a subset of another record: see makeClassy.
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          records (Hackage)
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              vinyl (Hackage)
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                  rawr (Hackage)
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                  Extensible records using GHC 8 features.

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                  • Do not require Template Haskell to use.
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                  • Only base dependency.
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                  • Support pattern matching, merging and partitioning (row-polymorphism) on anonymous records.
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                  • Support both lazy and strict fields.
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                  • Provide overloaded labels which can be used as field selectors or lenses.
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                  • Minimal performance overhead and memory footprint.
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                  • Requires GHC >= 8.0.
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                  • Only support type-level Symbol as indexes. (Unlike Vinyl)
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                  None, as the package is still very new.

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                  superrecord (Hackage)
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                      row-types (Hackage)
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                      Row-types is a library of open records and variants for Haskell

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