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For iterator

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This iterates from 4 to 13 (inclusive). 

for i in 4..13
    puts "this is #{i}.th number"
end

We can also iterate over arrays using for 

names = ['Siva', 'Charan', 'Naresh', 'Manish']

for name in names
    puts name
end
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Iteration:
* Iteration
* Each
* Implementation in a class
* Iterating over complex objects
* For iterator
* Iteration with index
* Map
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