Rosetta Code

Word frequency

Count the frequency of normalized words in a short sample passage.

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Sourcerosettacode/popular/word_frequency.vibe
def letter?(char: string) -> bool
  (char >= "a" && char <= "z") || (char >= "A" && char <= "Z")
end

def word_counts(text: string) -> hash<string, int>
  text_chars = text.chars
  counts: hash<string, int> = {}
  current = ""
  index = 0

  while index < text.length
    char = text_chars.fetch(index)
    if letter?(char)
      current = current + char.downcase
    elsif current != ""
      counts[current] = counts.fetch(current, 0) + 1
      current = ""
    end
    index = index + 1
  end

  if current != ""
    counts[current] = counts.fetch(current, 0) + 1
  end

  counts
end

def run -> array<{ count: int, word: string }>
  counts = word_counts("To be, or not to be: that is the question. To be or not?")
  rows: array<{ count: int, word: string }> = []
  rows.push({ word: "to", count: counts.fetch("to", 0) })
  rows.push({ word: "be", count: counts.fetch("be", 0) })
  rows.push({ word: "not", count: counts.fetch("not", 0) })
  rows.push({ word: "question", count: counts.fetch("question", 0) })
  rows
end

Output

Click Run example to see the result.

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