Ruby yield and block and Iterators

The key word 'yield' is the core of Iterators, So I use a Iterators to clarify the 'yield'

class Sequence        include Enumerable        def initialize(from, to, by)                @from, @to, @by = from, to, by        end        def each                x = @from                y = @by                while x<= @to                        yield x         #We will do something to the x, but not now, the operation will ensure in  the following block.                        x += @by                end        endend

We have use the 'yield' to possess the code line, but have not define the actual operationThen, we can use block to take the place!
s = Sequence.new(1, 10 , 2)s.each {|a| print a}    #The |a| means use 'a' to alias the 'x''s place, then use 'print' to take the 'yield''s place

So the result is:13579
If we use bellow codes
s = Sequence.new(1, 10 , 2)s.each {print 1}          #Nothing will alias to x, but the 'print 1' will take the 'yield''s place

So, the result would be:11111 

	
				
	
					   
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