Format tip pair as a single value when the two values are equal? #2135

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1. Fil

   added

   enhancementNew feature or requestNew feature or request

   on Aug 15, 2024
2. Fil

   self-assigned this

   on Aug 15, 2024
3. Fil

   changed the title [-]Format tip pair as a single value when the two values are equal[/-] [+]Format tip pair as a single value when the two values are equal?[/+] on Aug 15, 2024
4. Fil commented on Aug 22, 2024

   

   Fil

   on Aug 22, 2024

   ContributorAuthor

   More actions

   A case found in the wild: the binning of integers between 0 and 7, that results (by default) in small bins such as [4 — 4.5]. If the format was showing only the integer part (as suggested in #1268), this PR would automagically solve this case.
   

   (However in this case, we'd also want the bin labels to be "4" and not "4 inclusive to 5 exclusive".)
5. mwaibel-go commented on Jan 28, 2026

   

   mwaibel-go

   on Jan 28, 2026

   More actions

   A first step that would allow API consumers to solve this would be to pass the bin boundaries to a custom formatter function instead of each boundary individually.

   To be clear, I’m talking about this API:

   Plot.binX(
     { y: 'count' },
     { x: 'startTimestamp',
       thresholds: 'day',
       tip: {
         format: {
           x: (date) => getGermanDate(date)
         }
       }
     },
   )

   Since I’m binning by days, the tip will look like “01.01.2026–01.01.2026”. This could be avoided if I could instead provide the formatter as

   format: {
     x: ([date1, date2]) => {
       const formattedDate1 = getGermanDate(date1)
       const formattedDate2 = getGermanDate(date2)
       return formattedDate1 !== formattedDate2 ? `${formattedDate1}–${formattedDate2}`: formattedDate1
     }
   }