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module Enumerable
# Abstract the common pattern of injecting a hash into a block to accumulate
# and return the injected hash.
#
# Both of these are equivalent
# [1,2,3].inject({}){|m,i| m[i] = i; m }
# [1,2,3].injecting({}){|m,i| m[i] = i }
# => {1=>1, 2=>2, 3=>3}
#
# The main difference is with injecting you do not have to end the block
# with ;m to return the accumulated hash m. In this sense it is very much
# like Object#returning
def injecting(s)
inject(s) do |k, i|
yield(k, i); k
end
end
# Look for any of an array of things inside another array (or any Enumerable).
#
# ['louie', 'bert'].include_any?('louie', 'chicken')
# => true
def include_any?(*args)
args.any? {|arg| self.include?(arg) }
end
#
# Returns a hash, which keys are evaluated result from the
# block, and values are arrays of elements in <i>enum</i>
# corresponding to the key.
#
# (1..6).group_by {|i| i%3} #=> {0=>[3, 6], 1=>[1, 4], 2=>[2, 5]}
#
# This is included in Ruby 1.9
# http://www.ruby-doc.org/core-1.9/classes/Enumerable.html#M002672
#
# Implementation from Ruby on Rails:
# trunk/activesupport/lib/active_support/core_ext/enumerable.rb
# [rev 5334]
#
def group_by
inject({}) do |groups, element|
(groups[yield(element)] ||= []) << element
groups
end
end if RUBY_VERSION < '1.9'
end
Version data entries
8 entries across 8 versions & 1 rubygems