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tag: v2.1.0
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require 'enumerator'
module ActiveSupport #:nodoc:
module CoreExtensions #:nodoc:
module Array #:nodoc:
module Grouping
# Iterates over the array in groups of size +number+, padding any remaining
# slots with +fill_with+ unless it is +false+.
#
# %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)
if fill_with == false
collection = self
else
# size % number gives how many extra we have;
# subtracting from number gives how many to add;
# modulo number ensures we don't add group of just fill.
padding = (number - size % number) % number
collection = dup.concat([fill_with] * padding)
end
if block_given?
collection.each_slice(number, &block)
else
returning [] do |groups|
collection.each_slice(number) { |group| groups << group }
end
end
end
# Divides the array into one or more subarrays based on a delimiting +value+
# or the result of an optional block.
#
# [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
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