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yield (co-routines / generator)
Control Structures example from a Well House Consultants training course
More on Control Structures [link]
Source code: yrb Module: R104
=begin
In Ruby, a named piece of code (method) can return a result via a yield ... and then resume in due course. That may sound a bit technical, but it allows you to code a function which doesn't run through to completion at one go, but rather returns results as it generates them, passing the results for the calling code to handle as it will. =end # This function includes yield, passing results back one at a time def fibonacci(limit) i = current = previous = 1 # pass back what we have so far yield 1 ; yield 1 while (i < limit) temp = current current += previous previous = temp # pass back what we have so far yield current i += 1 end end # And here is the call to the function - in this demonstration it's # just a simple print loop but it could be much more! fibonacci(15) do |dis| puts dis end =begin Sample output: Dorothy:rn grahamellis$ ruby yrb 1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 Dorothy:rn grahamellis$ =end Learn about this subject
This module and example are covered on the following public courses:
* Learning to program in Ruby * Ruby Programming Also available on on site courses for larger groups Books covering this topic
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