Arrayize! convert any non-array object to an array. Leave any existing array alone. Array() doesn't work for hashes.

# Arrayize! convert any non-array object to an array.  Leave any existing array alone.
def arrayize(object)
  return [object] unless object.is_a?(Array)
  object
end

def arrayize2(object)
  Array.new(1) { object }.flatten
end

def enumerize(object)
  object.enum_for
end

Benchmark results

for object being an array already and an object that is a hash

puts Benchmark.measure { 1_000_000.times { |t| arrayize(['blah']) } }
0.460000   0.000000   0.460000 (  0.458994)
puts Benchmark.measure { 1_000_000.times { |t| arrayize({test: 'blah'}) } }
1.060000   0.010000   1.070000 (  1.064968)

puts Benchmark.measure { 1_000_000.times { |t| arrayize2(['blah']) } }
2.110000   0.000000   2.110000 (  2.112629)
puts Benchmark.measure { 1_000_000.times { |t| arrayize2({test: 'blah'}) } }
2.350000   0.010000   2.360000 (  2.356239)

puts Benchmark.measure { 1_000_000.times { |t| enumerize(['blah']) } }
0.800000   0.000000   0.800000 (  0.803645)
puts Benchmark.measure { 1_000_000.times { |t| enumerize({test: 'blah'}) } }
1.270000   0.000000   1.270000 (  1.269319)

codebender/gist:5327211