Class: Range
Overview
:nodoc:
Direct Known Subclasses
Instance Method Summary collapse
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#sum(identity = 0) ⇒ Object
Optimize range sum to use arithmetic progression if a block is not given and we have a range of numeric values.
Instance Method Details
#sum(identity = 0) ⇒ Object
Optimize range sum to use arithmetic progression if a block is not given and we have a range of numeric values.
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# File 'lib/gorillib/enumerable/sum.rb', line 34 def sum(identity = 0) return super if block_given? || !(first.instance_of?(Integer) && last.instance_of?(Integer)) actual_last = exclude_end? ? (last - 1) : last (actual_last - first + 1) * (actual_last + first) / 2 end |