Python's enumerate in Ruby?

Something like this in Python:

a = ['do', 're', 'mi', 'fa']
for i, s in enumerate(a):
    print('%s at index %d' % (s, i))

becomes this in Ruby:

a = %w(do re mi fa)
a.each_with_index do |s,i|
    puts "#{s} at index #{i}"
end

Assuming it's for enumeration, each_with_index can do that. Or if you have an Enumerator, just use with_index.

Maybe a quicker solution would be :

%w(a b c).map.with_index {|x, i| [i, x] }

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