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as-cii/gist:ea76e04a352b19713a2e

Created April 28, 2015 14:32
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Remove temp with functional
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gistfile1.rb
###
### First approach
###
[class_months(es, class_name)].flat_map { |range| [range.count.to_f, month_range(range.first, upto_date).count] }
.reduce(:/) * 100
###
### Second Approach
###
# define operator `?` as `memoize function`
?class_months(es, class_name).count.to_f / month_range(?class_months(es, class_name).first, upto_date).count * 100.0
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