Sha256: 920613cd308101209cb92df345733afe98593aa984b36c1f896924fc6267ef87
Contents?: true
Size: 548 Bytes
Versions: 15
Compression:
Stored size: 548 Bytes
Contents
# frozen_string_literal: true
Hash.class_eval do
# Invert a hash keeping possible duplicate values.
# @see Hash#invert for more details or to use without keeping duplicates.
# @see https://stackoverflow.com/a/10989394/8806642 for source.
#
# @example
# h = {:a => 1, :b => 2, :c => 3, :d => 4, :z => 1}
# h.invert
# # => {1=>:z, 2=>:b, 3=>:c, 4=>:d}
# h.invert_with_dups
# # => {1=>[:a, :z], 2=>[:b], 3=>[:c], 4=>[:d]}
#
# @return [Hash]
#
def invert_with_dups
keys.group_by { |key| self[key] }
end
end
Version data entries
15 entries across 15 versions & 1 rubygems