module Enumerable
Public Instance Methods
drop_last(n)
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# File lib/flash_extensions/extensions/enumerable_extension.rb, line 9 def drop_last(n) array = to_a return array if n > array.size array[0...(array.size - n)] end
drop_last_while() { |value| ... }
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# File lib/flash_extensions/extensions/enumerable_extension.rb, line 16 def drop_last_while return to_enum(:drop_last_while) unless block_given? result = [] dropping = true reverse_each do |value| result.unshift(value) unless dropping &&= yield(value) end result end
exactly?(n) { |*o| ... }
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# File lib/flash_extensions/extensions/enumerable_extension.rb, line 27 def exactly?(n) found_count = 0 if block_given? each do |*o| found_count += 1 if yield(*o) end else each do |o| found_count += 1 if o end end (found_count > n) ? false : n == found_count end
frequencies()
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# File lib/flash_extensions/extensions/enumerable_extension.rb, line 43 def frequencies each_with_object(Hash.new(0)) { |e, a| a[e] += 1 } end
max(identity=0)
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# File lib/flash_extensions/extensions/enumerable_extension.rb, line 47 def max(identity=0) size > 0 ? sort.last : identity end
mean(identity=0)
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# File lib/flash_extensions/extensions/enumerable_extension.rb, line 55 def mean(identity=0) collection_size = size collection_size > 0 ? inject(:+) / collection_size.to_f : identity end
median(identity=0)
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# File lib/flash_extensions/extensions/enumerable_extension.rb, line 60 def median(identity=0) collection_size = size collection_sorted = sort if collection_size > 0 if collection_size % 2 == 0 (collection_sorted[(collection_size / 2) -1] + collection_sorted[collection_size / 2]) / 2.0 else collection_sorted[collection_size / 2] end else identity end end
min(identity=0)
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# File lib/flash_extensions/extensions/enumerable_extension.rb, line 51 def min(identity=0) size > 0 ? sort.first : identity end
mode(identity=0)
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# File lib/flash_extensions/extensions/enumerable_extension.rb, line 75 def mode(identity=0) if size > 0 frequency_distribution = inject(Hash.new(0)) { |h, v| h[v] += 1; h } frequency_top_2 = frequency_distribution.sort { |a, b| b[1] <=> a[1] }.take(2) if frequency_top_2.length == 1 frequency_top_2.first.first elsif frequency_top_2.first.last == frequency_top_2.last.last nil else frequency_top_2.first.first end else identity end end
range(identity=0)
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# File lib/flash_extensions/extensions/enumerable_extension.rb, line 92 def range(identity=0) collection_sorted = sort size > 0 ? collection_sorted.last - collection_sorted.first : identity end
several?() { |*o| ... }
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# File lib/flash_extensions/extensions/enumerable_extension.rb, line 97 def several? found_count = 0 if block_given? each do |*o| found_count += 1 if yield(*o) end else each do |o| found_count += 1 if o end end (found_count > 1) ? true : false end
standard_deviation()
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# File lib/flash_extensions/extensions/enumerable_extension.rb, line 113 def standard_deviation return 0 if length < 2 Math.sqrt(variance) end
sum(identity=0)
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# File lib/flash_extensions/extensions/enumerable_extension.rb, line 4 def sum(identity=0) inject(:+) || identity end
take_last(n)
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# File lib/flash_extensions/extensions/enumerable_extension.rb, line 118 def take_last(n) array = to_a return array if n > array.size array[(array.size - n)..-1] end
take_last_while() { |e| ... }
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# File lib/flash_extensions/extensions/enumerable_extension.rb, line 125 def take_last_while return to_enum(:take_last_while) unless block_given? result = [] reverse_each { |e| yield(e) ? result.unshift(e) : break } result end
variance()
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# File lib/flash_extensions/extensions/enumerable_extension.rb, line 133 def variance collection_length = length return 0 if collection_length <= 1 sum = inject(0) { |accumulator, value| accumulator + (value - mean) ** 2 } sum / (collection_length.to_f - 1) end