Beginner Exercism • ruby

Parallel Letter Frequency

Challenge Overview

Count the frequency of letters in texts using parallel computation.

Instructions

Count the frequency of letters in texts using parallel computation.

Parallelism is about doing things in parallel that can also be done sequentially. A common example is counting the frequency of letters. Employ parallelism to calculate the total frequency of each letter in a list of texts.

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Solution 1 by @Mwr256 (⭐ 1) — View on Exercism
Solution 2 by @fpsvogel (⭐ 0) — View on Exercism
Solution 3 by @joohan (⭐ 0) — View on Exercism

Source: Exercism ruby/parallel-letter-frequency

💡 View Solution

class ParallelLetterFrequency
  def self.count(texts)

    ret_val = Hash.new(0)
    return ret_val if texts.empty?

    threads = texts.map do |text|
      Thread.new do
        format_text = text.downcase.gsub(/[^\p{L}a-z]/, '')
        format_text.each_char { |char| ret_val[char] += 1 }