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# rake a:b[xx,yy]
desc "description place"
namespace :a do
  task :b, :x, :y do |t, args|
    args[:x]
    args[:y]
  end
end
# rake c
task :c do

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def do_each(hash)
  result = {}
  hash.each { |key, value| result[key] = do_something(value) }
  result
end

def do_inject(hash)
  hash.inject({}) { |result, pair| result[pair.first] = do_something(pair.last); result }
end

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def do_each(hash)
  result = {}
  hash.each { |key, value| result[key] = do_something(value) }
  result
end

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def do_inject(hash)
  hash.inject({}) { |result, pair| result[pair.first] = do_something(pair.last); result }
end

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def do_tap(hash)
  {}.tap do |result|
    hash.each { |key, value| result[key] = do_something(value) }
  end
end

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def do_map(hash)
  Hash[hash.map { |key, value| [key, do_something(value)] }]
end

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$ ruby q.rb 
1 true
2 false
3 true
4 false
5 A
Run options: --seed 65268

# Running tests:

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sum = ->x,y,z { x + y + z }.curry
puts sum[2][3][4]
=> 9

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(defn pi
  ([] (pi 0))
  ([x] (println x) #(pi (+ x 1))))

; result
=> (((((((pi)))))))
0
1
2
3

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prime = -> a=[false, false], z=1 do
  n = a.size + 1
  b = a + [true]
  (2..Math.sqrt(a.size)).each do |i|
    if b[i]
      x = 0
      while (y = i**2+x*i) < n
        b[y] = false
        x += 1
      end