Sha256: d6754dbee94efea8ca58d238dc2b68c4b4e0da6a21ae4871808ad88e92fea39e
Contents?: true
Size: 693 Bytes
Versions: 10
Compression:
Stored size: 693 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 10 versions & 1 rubygems