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View iter.rb
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# Ruby iteration
 
range = (1..100)
 
# internal iteration
range.each { |i| puts i } #=> 1, 2, 3, 4, ..
 
# external iteration
it = range.to_enum
it.next #=> 1
it.next #=> 2
 
# generator object (lazily generating values)
g = Enumerator.new { |y|
v = 0
while true
y.yield v += 2
end
}
 
g.next #=> 2
g.next #=> 4
 
 
 
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