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module MoreCoreExtensions
module RangeStepValue
# Iterates over rng, starting with the beginning of rng, incrementing by the
# value, and passing that element to the block. Unlike +step+, +step_value+
# invokes the + operator to iterate over the range elements. Unless the end is
# excluded from the range, the final value of the iteration will always be the
# end value, even if the increment value goes past the end of the range.
#
# This method has performance benefits over +step+ when working with ranges of
# Time objects, for example, where step calling succ may be called an
# inordinate number of times.
#
# t = Time.now.midnight
# range = (t - 3.days)..t
# range.step_value(1.day) {|x| puts x}
#
# produces:
# Tue Dec 14 00:00:00 -0500 2010
# Wed Dec 15 00:00:00 -0500 2010
# Thu Dec 16 00:00:00 -0500 2010
# Fri Dec 17 00:00:00 -0500 2010
#
def step_value(value)
if block_given?
return if self.begin > self.end
iter = self.begin
loop do
yield iter unless iter == self.end && exclude_end?
break if iter == self.end
iter += value
iter = self.end if iter > self.end
end
self
else
ret = []
step_value(value) { |v| ret << v }
ret
end
end
end
end
Range.send(:include, MoreCoreExtensions::RangeStepValue)
Version data entries
14 entries across 14 versions & 1 rubygems