Ranges

Sort values into buckets

Use ranges in case branches to label values and count how many land in each bucket.

Reference

Edit the source, then Run. Checks start after your first Run. Ctrl/⌘ + Enter runs; Tab indents. Preview services use sample data and never contact a real service.

Sourceupstream/ranges/buckets.vibe
def shipping_tier(grams: int) -> string
  case grams
  when 0...500 then "letter"
  when 500...2_000 then "small parcel"
  when 2_000..20_000 then "parcel"
  else "freight"
  end
end

def grade(score: int) -> string
  case score
  when 90..100 then "A"
  when 80...90 then "B"
  when 70...80 then "C"
  else "needs review"
  end
end

type RunResult = {
  tiers: hash<string, string>,
  tier_counts: hash<string, int>,
  grades: array<string>,
  histogram: array<string>
}

def run -> RunResult
  parcels: hash<string, int> = {
    card: 40,
    book: 900,
    lamp: 3_500,
    desk: 42_000,
    mug: 480
  }
  scores = [97, 83, 88, 71, 64, 90]
  counts = scores.map { |score| grade(score) }.tally

  {
    tiers: parcels.transform_values { |grams| shipping_tier(grams) },
    tier_counts: parcels.values.map { |grams| shipping_tier(grams) }.tally,
    grades: scores.map { |score| "#{score}: #{grade(score)}" },
    histogram: ["A", "B", "C", "needs review"].map { |bucket|
      "#{bucket.ljust(12)} #{"#" * counts.fetch(bucket, 0)}"
    }
  }
end

Output

Click Run example to see the result.

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