Deconstructing arrays in block arguments

block-arg-array-deconstruction.rb

h1       = {
  :one   => 1,
  :two   => 2,
  :three => 3,
}
# h1 => { :one => 1, :two => 2, :three => 3 }

#
# Each key/value pair is passed as a two-element array as the second
# block argument -- so you can deconstruct it in the arglist declaration.
#
h2 = h1.inject({}) { |memo,(key,val)|
  memo[key.to_s] = val
  memo
}

# h2 => { "one" => 1, "two" => 2, "three" => 3 }