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Ruby On Rails in UA/Code Review, теоретические вопросы/Итерации с хешами

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2008-06-10 06:57:36	Ответить
Ruslan Voloshin Адрес: odessa Сообщений: 1231 Регистр: 2007-03-13 его блог 40 сообщ.	Итерации с хешами
	hash = { 1 => 'one', [1,2] => 'two', 'three' => 'three' } hash.each_pair { \|key, value\| puts "#{key.inspect} maps to #{value}"} # [1, 2] maps to two # "three" maps to three # 1 maps to one #--- active_toggles = { 'super' => true, 'meta' => true, 'hyper' => true } active_toggles.each_key { \|active\| puts active } # hyper # meta # super #--- favorite_colors = { 'Alice' => :red, 'Bob' => :violet, 'Mallory' => :blue, 'Carol' => :blue, 'Dave' => :violet } summary = Hash.new(0) favorite_colors.each_value { \|x\| summary[x] += 1 } summary # => {:red=>1, :violet=>2, :blue=>2} #--- hash = {} 1.upto(10) { \|x\| hash[x] = x * x } hash.has_value? 49 # => true hash.has_value? 81 # => true hash.has_value? 50 # => false #--- 1.upto(100) { \|x\| hash[x] = true } hash.keys { \|k\| hash[k * 2] = true } # RuntimeError: hash modified during iteration #--- hash = {1 => 2, 2 => 2, 3 => 10} hash.keys # => [1, 2, 3] hash.values # => [2, 2, 10] hash.to_a # => [[1, 2], [2, 2], [3, 10]] #--- extensions = { 'Alice' => '104', 'Carol' => '210', 'Bob' => '110' } extensions.keys.sort.each do \|k\| puts "#{k} can be reached at extension ##{extensions[k]}" end # Alice can be reached at extension #104 # Bob can be reached at extension #110 # Carol can be reached at extension #210 #--- to_do = { 'Clean car' => 5, 'Take kangaroo to vet' => 3, 'Realign plasma conduit' => 3 } to_do.sort_by { \|task, priority\| [priority, task] }.each { \|k,v\| puts k } # Realign plasma conduit # Take kangaroo to vet # Clean car #--- transform_results = { 4 => 8, 9 => 9, 10 => 6, 2 => 7, 6 => 5 } by_size_of_difference = transform_results.sort_by { \|x, y\| (x-y).abs } by_size_of_difference.each { \|x, y\| puts "f(#{x})=#{y}: difference #{y-x}" } # f(9)=9: difference 0 # f(6)=5: difference -1 # f(10)=6: difference -4 # f(4)=8: difference 4 # f(2)=7: difference 5 #--- ------------ Занимаюсь вебом и продвижением сайтов.
	.each_key, .each_value, .to_a, keys, values

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