Sha256: 8001d48109196453330ddfe89c1077da4a508e602a91bfc0936f5e54e49c9631
Contents?: true
Size: 821 Bytes
Versions: 58
Compression:
Stored size: 821 Bytes
Contents
# encoding: utf-8
module Enumerable
if !Enumerable.instance_methods.include?('group_by')
# Returns a hash, which keys are evaluated result from the block, and
# values are arrays of elements in enum corresponding to the key. This
# method is provided for backward compatibility with Ruby 1.8.6 and lower,
# since {#group_by} is only available in 1.8.7 and higher.
#
# @yieldparam [Object] obj The object to classify
#
# @return [Hash]
#
# @example Grouping integers by rest by division through 3
#
# (1..6).group_by { |i| i % 3 }
# # => { 0 => [3, 6], 1 => [1, 4], 2 => [2, 5] }
def group_by
groups = {}
each do |item|
key = yield(item)
groups[key] ||= []
groups[key] << item
end
groups
end
end
end
Version data entries
58 entries across 58 versions & 2 rubygems