Sha256: 1aabbf9be28d4ac2ad3b1ddfeb3fa5f9a60732a27eac2030a0b8e27373d97d9d
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Size: 675 Bytes
Versions: 13
Compression:
Stored size: 675 Bytes
Contents
module Alf
class Aggregator
#
# Defines a `collect()` aggregation operator.
#
# Example:
#
# # direct ruby usage
# Alf::Aggregator.collect{ qty }.aggregate(...)
#
# # lispy
# (summarize :supplies, [:sid], :col => collect{ qty })
#
class Collect < Aggregator
# Returns [] as least value.
#
# @see Aggregator::InstanceMethods#least
def least()
[]
end
# Aggregates on a tuple occurence.
#
# @see Aggregator::InstanceMethods#_happens
def _happens(memo, val)
memo << val
end
end # class Collect
end # class Aggregator
end # module Alf
Version data entries
13 entries across 13 versions & 2 rubygems