Sha256: e55bb9b4df25bf83eb6efd677fb3799a67fff2d1831c49f0facb265a3fb46447
Contents?: true
Size: 723 Bytes
Versions: 13
Compression:
Stored size: 723 Bytes
Contents
module Alf
class Aggregator
#
# Defines a `max()` aggregation operator.
#
# Example:
#
# # direct ruby usage
# Alf::Aggregator.max{ qty }.aggregate(...)
#
# # lispy
# (summarize :supplies, [:sid], :max => max{ qty })
#
class Max < Aggregator
# Returns nil as least value.
#
# @see Aggregator::InstanceMethods#least
def least()
nil
end
# Aggregates on a tuple occurence through `memo > val ? memo : val`
#
# @see Aggregator::InstanceMethods#_happens
def _happens(memo, val)
memo.nil? ? val : (memo > val ? memo : val)
end
end # class Max
end # class Aggregator
end # module Alf
Version data entries
13 entries across 13 versions & 2 rubygems