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Contents
module ActiveSupport #:nodoc:
module CoreExtensions #:nodoc:
module Array #:nodoc:
module Grouping
# Iterate over an array in groups of a certain size, padding any remaining
# slots with specified value (<tt>nil</tt> by default) unless it is
# <tt>false</tt>.
#
# E.g.
#
# %w(1 2 3 4 5 6 7).in_groups_of(3) {|g| p g}
# ["1", "2", "3"]
# ["4", "5", "6"]
# ["7", nil, nil]
#
# %w(1 2 3).in_groups_of(2, ' ') {|g| p g}
# ["1", "2"]
# ["3", " "]
#
# %w(1 2 3).in_groups_of(2, false) {|g| p g}
# ["1", "2"]
# ["3"]
def in_groups_of(number, fill_with = nil, &block)
require 'enumerator'
collection = dup
collection << fill_with until collection.size.modulo(number).zero? unless fill_with == false
grouped_collection = [] unless block_given?
collection.each_slice(number) do |group|
block_given? ? yield(group) : grouped_collection << group
end
grouped_collection unless block_given?
end
# Divide the array into one or more subarrays based on a delimiting +value+
# or the result of an optional block.
#
# ex.
#
# [1, 2, 3, 4, 5].split(3) # => [[1, 2], [4, 5]]
# (1..10).to_a.split { |i| i % 3 == 0 } # => [[1, 2], [4, 5], [7, 8], [10]]
def split(value = nil, &block)
block ||= Proc.new { |e| e == value }
inject([[]]) do |results, element|
if block.call(element)
results << []
else
results.last << element
end
results
end
end
end
end
end
end
Version data entries
76 entries across 76 versions & 5 rubygems