Sha256: b591f40989b1946a6d94998e319769d8ea530ec1d3087b1f55da1865f85b1fae
Contents?: true
Size: 697 Bytes
Versions: 10
Compression:
Stored size: 697 Bytes
Contents
class Hash
# Hash intersection. Two hashes intersect
# when their pairs are equal.
#
# ({:a=>1,:b=>2} & {:a=>1,:c=>3}) #=> {:a=>1}
#
# A hash can also be intersected with an array
# to intersect keys only.
#
# ({:a=>1,:b=>2} & [:a,:c]) #=> {:a=>1}
#
# The later form is similar to #pairs_at. The differ only
# in that #pairs_at will return a nil value for a key
# not in the hash, but #& will not.
#
# CREDIT: Trans
def &(other)
case other
when Array
k = (keys & other)
Hash[*(k.zip(values_at(*k)).flatten)]
else
x = (to_a & other.to_a).inject([]) do |a, kv|
a.concat kv; a
end
Hash[*x]
end
end
end
Version data entries
10 entries across 9 versions & 2 rubygems