Ruby\u306e\u30cf\u30c3\u30b7\u30e5\u306f\u3001\u30ad\u30fc\u3068\u5024\u306e\u30da\u30a2\u3092\u7ba1\u7406\u3059\u308b\u5f37\u529b\u306a\u30c7\u30fc\u30bf\u69cb\u9020\u3067\u3059\u3002
\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u30cf\u30c3\u30b7\u30e5\u306e\u57fa\u672c\u304b\u3089\u9ad8\u5ea6\u306a\u4f7f\u3044\u65b9\u307e\u3067\u3001\u5b9f\u8df5\u7684\u306a\u4f8b\u3092\u4ea4\u3048\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002
\u521d\u5fc3\u8005\u304b\u3089\u30d9\u30c6\u30e9\u30f3\u307e\u3067\u3001Ruby\u30d7\u30ed\u30b0\u30e9\u30de\u30fc\u306e\u30b9\u30ad\u30eb\u30a2\u30c3\u30d7\u306b\u5f79\u7acb\u3064\u60c5\u5831\u304c\u6e80\u8f09\u3067\u3059\u3002<\/p>\n\n\n\n
\u3053\u308c\u3089\u306e\u9805\u76ee\u3092\u901a\u3058\u3066\u3001\u8aad\u8005\u306fRuby\u306e\u30cf\u30c3\u30b7\u30e5\u3092\u52b9\u679c\u7684\u306b\u6d3b\u7528\u3059\u308b\u305f\u3081\u306e\u77e5\u8b58\u3068\u30b9\u30ad\u30eb\u3092\u8eab\u306b\u3064\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
\u76ee\u6b21 <\/p>\n
Ruby\u306e\u30cf\u30c3\u30b7\u30e5\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u304a\u3051\u308b\u5f37\u529b\u306a\u30c7\u30fc\u30bf\u69cb\u9020\u306e1\u3064\u3067\u3059\u3002
\u7c21\u5358\u306b\u8a00\u3048\u3070\u3001\u30cf\u30c3\u30b7\u30e5\u306f\u300c\u30ad\u30fc\u300d\u3068\u300c\u5024\u300d\u306e\u30da\u30a2\u3092\u683c\u7d0d\u3059\u308b\u30b3\u30f3\u30c6\u30ca\u306e\u3088\u3046\u306a\u3082\u306e\u3067\u3059\u3002<\/p>\n\n\n\n
\u4f8b\u3048\u3070\u3001\u6b21\u306e\u3088\u3046\u306a\u30cf\u30c3\u30b7\u30e5\u3092\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
person = {\n \"name\" => \"\u5c71\u7530\u592a\u90ce\",\n \"age\" => 30,\n \"occupation\" => \"\u30a8\u30f3\u30b8\u30cb\u30a2\"\n}<\/pre>\n\n\n\n\u3053\u3053\u3067\u306f\u3001\u201dname\u201d\u3001\u201dage\u201d\u3001\u201doccupation\u201d\u304c\u30ad\u30fc\u3067\u3001\u305d\u308c\u305e\u308c\u306b\u5bfe\u5fdc\u3059\u308b\u201d\u5c71\u7530\u592a\u90ce\u201d\u300130\u3001\u201d\u30a8\u30f3\u30b8\u30cb\u30a2\u201d\u304c\u5024\u3067\u3059\u3002
\u30ad\u30fc\u3092\u4f7f\u3063\u3066\u3001\u7c21\u5358\u306b\u5024\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
puts person[\"name\"] # \u51fa\u529b: \u5c71\u7530\u592a\u90ce\nputs person[\"age\"] # \u51fa\u529b: 30<\/pre>\n\n\n\n\u914d\u5217\u3068\u306e\u9055\u3044\uff1a\u3069\u3093\u306a\u6642\u306b\u30cf\u30c3\u30b7\u30e5\u3092\u4f7f\u3046\u3079\u304d\u304b<\/h3>\n\n\n\n
\u30cf\u30c3\u30b7\u30e5\u3068\u914d\u5217\u306f\u4f3c\u3066\u3044\u308b\u3088\u3046\u3067\u7570\u306a\u308b\u30c7\u30fc\u30bf\u69cb\u9020\u3067\u3059\u3002\u4ee5\u4e0b\u306e\u8868\u3067\u4e3b\u306a\u9055\u3044\u3092\u6bd4\u8f03\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n
\n\u7279\u5fb4<\/th> \u30cf\u30c3\u30b7\u30e5<\/th> \u914d\u5217<\/th><\/tr><\/thead> \u30a2\u30af\u30bb\u30b9\u65b9\u6cd5<\/td> \u30ad\u30fc\u3092\u4f7f\u7528<\/td> \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\uff08\u6570\u5b57\uff09\u3092\u4f7f\u7528<\/td><\/tr> \u9806\u5e8f<\/td> \u9806\u5e8f\u306a\u3057\uff08Ruby 1.9\u4ee5\u964d\u306f\u633f\u5165\u9806\uff09<\/td> \u9806\u5e8f\u3042\u308a<\/td><\/tr> \u8981\u7d20\u306e\u8b58\u5225<\/td> \u4efb\u610f\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff08\u901a\u5e38\u306f\u6587\u5b57\u5217\u3084\u30b7\u30f3\u30dc\u30eb\uff09<\/td> 0\u304b\u3089\u59cb\u307e\u308b\u9023\u7d9a\u3057\u305f\u6574\u6570<\/td><\/tr> \u4e3b\u306a\u7528\u9014<\/td> \u95a2\u9023\u30c7\u30fc\u30bf\u306e\u7ba1\u7406\u3001\u8f9e\u66f8\u306e\u3088\u3046\u306a\u4f7f\u7528<\/td> \u30ea\u30b9\u30c8\u306e\u7ba1\u7406\u3001\u9806\u5e8f\u304c\u91cd\u8981\u306a\u30c7\u30fc\u30bf<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n\u30cf\u30c3\u30b7\u30e5\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5834\u5408\u306b\u7279\u306b\u4fbf\u5229\u3067\u3059\u3002<\/p>\n\n\n\n
<\/i><\/span>\u30cf\u30c3\u30b7\u30e5\u306e\u5229\u70b9<\/div><\/div>\n\n- \u30c7\u30fc\u30bf\u306b\u610f\u5473\u306e\u3042\u308b\u540d\u524d\u3092\u4ed8\u3051\u305f\u3044\u5834\u5408<\/li>\n\n\n\n
- \u9ad8\u901f\u306a\u691c\u7d22\u304c\u5fc5\u8981\u306a\u5834\u5408<\/li>\n\n\n\n
- \u8907\u96d1\u306a\u30c7\u30fc\u30bf\u69cb\u9020\u3092\u8868\u73fe\u3057\u305f\u3044\u5834\u5408<\/li>\n<\/ol>\n<\/div><\/div><\/div>\n\n\n\n
Ruby\u306b\u304a\u3051\u308b\u30cf\u30c3\u30b7\u30e5\u306e\u91cd\u8981\u6027\u3068\u6d3b\u7528\u30b7\u30fc\u30f3<\/h3>\n\n\n\n
Ruby\u3067\u306f\u3001\u30cf\u30c3\u30b7\u30e5\u304c\u975e\u5e38\u306b\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u307e\u3059\u3002
\u305d\u306e\u7406\u7531\u3068\u4e3b\u306a\u6d3b\u7528\u30b7\u30fc\u30f3\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
1. \u8a2d\u5b9a\u60c5\u5831\u306e\u7ba1\u7406<\/strong><\/h4>\n\n\n\n\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u8a2d\u5b9a\u3092\u30cf\u30c3\u30b7\u30e5\u3067\u7ba1\u7406\u3059\u308b\u3068\u3001\u7c21\u5358\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
config = {\n database: \"mysql\",\n host: \"localhost\",\n port: 3306\n }\n puts \"\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9: #{config[:database]}\"<\/pre>\n\n\n\n2. \u30c7\u30fc\u30bf\u306e\u96c6\u8a08<\/strong><\/h4>\n\n\n\n\u30cf\u30c3\u30b7\u30e5\u306f\u96c6\u8a08\u4f5c\u696d\u306b\u975e\u5e38\u306b\u9069\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
sales = [100, 200, 300, 100, 200]\n total_sales = sales.reduce(Hash.new(0)) do |result, sale|\n result[sale] += 1\n result\n end\n puts total_sales # \u51fa\u529b: {100=>2, 200=>2, 300=>1}<\/pre>\n\n\n\n3. API\u30ec\u30b9\u30dd\u30f3\u30b9\u306e\u51e6\u7406<\/strong><\/h4>\n\n\n\n\u591a\u304f\u306eAPI\u306fJSON\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3067\u30c7\u30fc\u30bf\u3092\u8fd4\u3057\u307e\u3059\u304c\u3001\u3053\u308c\u306fRuby\u306e\u30cf\u30c3\u30b7\u30e5\u3068\u76f8\u6027\u304c\u826f\u3044\u3067\u3059\u3002<\/p>\n\n\n\n
require 'json'\n\n api_response = '{\"name\": \"John\", \"age\": 30}'\n user_data = JSON.parse(api_response)\n puts \"\u540d\u524d: #{user_data['name']}, \u5e74\u9f62: #{user_data['age']}\"<\/pre>\n\n\n\n\u30cf\u30c3\u30b7\u30e5\u3092\u4f7f\u3044\u3053\u306a\u3059\u3053\u3068\u3067\u3001\u3088\u308a\u8aad\u307f\u3084\u3059\u304f\u3001\u52b9\u7387\u7684\u306aRuby\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002
\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u30cf\u30c3\u30b7\u30e5\u306e\u57fa\u672c\u64cd\u4f5c\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
<\/i>2. \u30cf\u30c3\u30b7\u30e5\u306e\u57fa\u672c\u64cd\u4f5c\u3092\u30de\u30b9\u30bf\u30fc\u3057\u3088\u3046<\/span><\/span><\/h2>\n\n\n\n\u30cf\u30c3\u30b7\u30e5\u306f\u975e\u5e38\u306b\u67d4\u8edf\u306a\u30c7\u30fc\u30bf\u69cb\u9020\u3067\u3059\u304c\u3001\u305d\u306e\u529b\u3092\u6700\u5927\u9650\u306b\u6d3b\u7528\u3059\u308b\u306b\u306f\u57fa\u672c\u7684\u306a\u64cd\u4f5c\u65b9\u6cd5\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002
\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u30cf\u30c3\u30b7\u30e5\u306e\u4f5c\u6210\u304b\u3089\u8981\u7d20\u306e\u64cd\u4f5c\u3001\u52b9\u7387\u7684\u306a\u5024\u306e\u53d6\u5f97\u65b9\u6cd5\u307e\u3067\u3001\u9806\u3092\u8ffd\u3063\u3066\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
\u30cf\u30c3\u30b7\u30e5\u306e\u4f5c\u6210\uff1a\u8907\u6570\u306e\u65b9\u6cd5\u3068\u4f7f\u3044\u5206\u3051<\/h3>\n\n\n\n
Ruby\u3067\u306f\u3001\u4ee5\u4e0b\u306e3\u3064\u306e\u65b9\u6cd5\u3067\u30cf\u30c3\u30b7\u30e5\u3092\u4f5c\u6210\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
1. \u30ea\u30c6\u30e9\u30eb\u8868\u8a18<\/h4>\n\n\n\nhash = { \"name\" => \"Alice\", \"age\" => 30 }\n# \u307e\u305f\u306f\uff08Ruby 1.9\u4ee5\u964d\uff09\nhash = { name: \"Alice\", age: 30 }<\/pre>\n\n\n\n2. Hash.new\u30e1\u30bd\u30c3\u30c9<\/h4>\n\n\n\nhash = Hash.new\n# \u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3092\u8a2d\u5b9a\u3059\u308b\u5834\u5408\nhash_with_default = Hash.new(0)<\/pre>\n\n\n\n3. Hash[]<\/code> \u30e1\u30bd\u30c3\u30c9<\/h4>\n\n\n\nhash = Hash[\"name\", \"Bob\", \"age\", 25]<\/pre>\n\n\n\n<\/i><\/span>\u4f7f\u3044\u5206\u3051\u306e\u30dd\u30a4\u30f3\u30c8<\/div><\/div>\n\n- \u30ea\u30c6\u30e9\u30eb\u8868\u8a18\u306f\u6700\u3082\u4e00\u822c\u7684\u3067\u3001\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u304c\u9ad8\u3044\u3067\u3059\u3002<\/li>\n\n\n\n
Hash.new<\/code>\u306f\u7a7a\u306e\u30cf\u30c3\u30b7\u30e5\u3092\u4f5c\u6210\u3059\u308b\u969b\u3084\u3001\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3092\u8a2d\u5b9a\u3057\u305f\u3044\u5834\u5408\u306b\u4fbf\u5229\u3067\u3059\u3002<\/li>\n\n\n\nHash[]<\/code>\u306f\u914d\u5217\u304b\u3089\u30cf\u30c3\u30b7\u30e5\u3092\u4f5c\u6210\u3059\u308b\u969b\u306b\u4f7f\u7528\u3055\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n<\/div><\/div><\/div>\n\n\n\n\u8981\u7d20\u306e\u8ffd\u52a0\u30fb\u66f4\u65b0\u30fb\u524a\u9664\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n1. \u8981\u7d20\u306e\u8ffd\u52a0<\/h4>\n\n\n\nhash = {}\nhash[\"key\"] = \"value\"\n# \u307e\u305f\u306f\nhash[:key] = \"value\"<\/pre>\n\n\n\n2. \u8981\u7d20\u306e\u66f4\u65b0<\/h4>\n\n\n\nhash = { name: \"Alice\" }\nhash[:name] = \"Bob\" # \u65e2\u5b58\u306e\u30ad\u30fc\u306e\u5024\u3092\u66f4\u65b0<\/pre>\n\n\n\n3. \u8981\u7d20\u306e\u524a\u9664<\/h4>\n\n\n\nhash = { name: \"Charlie\", age: 35 }\ndeleted_value = hash.delete(:age)\nputs deleted_value # \u51fa\u529b: 35\nputs hash # \u51fa\u529b: {:name=>\"Charlie\"}<\/pre>\n\n\n\n<\/i><\/span>\u30dd\u30a4\u30f3\u30c8<\/div><\/div>\n\n- \u5b58\u5728\u3057\u306a\u3044\u30ad\u30fc\u306b\u5bfe\u3057\u3066\u5024\u3092\u4ee3\u5165\u3059\u308b\u3068\u3001\u65b0\u3057\u3044\u8981\u7d20\u304c\u8ffd\u52a0\u3055\u308c\u307e\u3059\u3002<\/li>\n\n\n\n
- \u65e2\u5b58\u306e\u30ad\u30fc\u306b\u5bfe\u3057\u3066\u5024\u3092\u4ee3\u5165\u3059\u308b\u3068\u3001\u305d\u306e\u5024\u304c\u66f4\u65b0\u3055\u308c\u307e\u3059\u3002<\/li>\n\n\n\n
delete<\/code>\u30e1\u30bd\u30c3\u30c9\u306f\u524a\u9664\u3055\u308c\u305f\u8981\u7d20\u306e\u5024\u3092\u8fd4\u3059\u306e\u3067\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u5229\u7528\u3067\u304d\u307e\u3059\u3002<\/li>\n<\/ul>\n<\/div><\/div><\/div>\n\n\n\n\u30cf\u30c3\u30b7\u30e5\u5185\u306e\u5024\u3092\u52b9\u7387\u7684\u306b\u53d6\u5f97\u3059\u308b\u65b9\u6cd5<\/h3>\n\n\n\n1. \u30d6\u30e9\u30b1\u30c3\u30c8\u8a18\u6cd5<\/h4>\n\n\n\nhash = { name: \"David\", age: 40 }\nputs hash[:name] # \u51fa\u529b: David\nputs hash[:height] # \u51fa\u529b: nil\uff08\u30ad\u30fc\u304c\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\uff09<\/pre>\n\n\n\n2. fetch\u30e1\u30bd\u30c3\u30c9<\/h4>\n\n\n\nhash = { name: \"Eve\", age: 28 }\nputs hash.fetch(:name) # \u51fa\u529b: Eve\nputs hash.fetch(:height, \"Not found\") # \u51fa\u529b: Not found\uff08\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3092\u6307\u5b9a\uff09\n# puts hash.fetch(:height) # KeyError\u304c\u767a\u751f\uff08\u30ad\u30fc\u304c\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\uff09<\/pre>\n\n\n\n3. dig\u30e1\u30bd\u30c3\u30c9\uff08\u30cd\u30b9\u30c8\u3055\u308c\u305f\u30cf\u30c3\u30b7\u30e5\u306b\u4fbf\u5229\uff09<\/h4>\n\n\n\nnested_hash = { user: { name: \"Frank\", details: { age: 45 } } }\nputs nested_hash.dig(:user, :details, :age) # \u51fa\u529b: 45\nputs nested_hash.dig(:user, :details, :height) # \u51fa\u529b: nil\uff08\u30ad\u30fc\u304c\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\uff09<\/pre>\n\n\n\n\u52b9\u7387\u7684\u306a\u64cd\u4f5c\u306e\u305f\u3081\u306e\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n1. default_proc<\/code>\u3092\u4f7f\u7528\u3057\u3066\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3092\u52d5\u7684\u306b\u8a2d\u5b9a<\/h4>\n\n\n\ncounter = Hash.new { |hash, key| hash[key] = 0 }\ncounter[:apples] += 1\nputs counter[:apples] # \u51fa\u529b: 1\nputs counter[:bananas] # \u51fa\u529b: 0<\/pre>\n\n\n\n2. merge<\/code>\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u8907\u6570\u306e\u30cf\u30c3\u30b7\u30e5\u3092\u7d50\u5408<\/h4>\n\n\n\nhash1 = { a: 1, b: 2 }\nhash2 = { b: 3, c: 4 }\nmerged_hash = hash1.merge(hash2)\nputs merged_hash # \u51fa\u529b: {:a=>1, :b=>3, :c=>4}<\/pre>\n\n\n\n3. transform_values<\/code>\u3092\u4f7f\u7528\u3057\u3066\u5168\u3066\u306e\u5024\u3092\u5909\u63db<\/h4>\n\n\n\nprices = { apple: 100, banana: 80, orange: 120 }\ndiscounted_prices = prices.transform_values { |price| price * 0.9 }\nputs discounted_prices # \u51fa\u529b: {:apple=>90.0, :banana=>72.0, :orange=>108.0}<\/pre>\n\n\n\n\u6f14\u7fd2\u554f\u984c<\/h3>\n\n\n\n1. \u6b21\u306e\u30cf\u30c3\u30b7\u30e5\u3092\u4f5c\u6210\u3057\u3001\u65b0\u3057\u3044\u8981\u7d20\u3092\u8ffd\u52a0\u3001\u65e2\u5b58\u306e\u8981\u7d20\u3092\u66f4\u65b0\u3001\u305d\u3057\u30661\u3064\u306e\u8981\u7d20\u3092\u524a\u9664\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/h4>\n\n\n\nfruits = { apple: 5, banana: 3, orange: 7 }\n# \u3053\u3053\u306b\u30b3\u30fc\u30c9\u3092\u66f8\u3044\u3066\u304f\u3060\u3055\u3044<\/pre>\n\n\n\n2. \u4ee5\u4e0b\u306e\u30cd\u30b9\u30c8\u3055\u308c\u305f\u30cf\u30c3\u30b7\u30e5\u304b\u3089\u3001Alice\u306e\u5e74\u9f62\u3092\u53d6\u5f97\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/h4>\n\n\n\nusers = {\n alice: { name: \"Alice\", age: 28 },\n bob: { name: \"Bob\", age: 35 }\n}\n# \u3053\u3053\u306b\u30b3\u30fc\u30c9\u3092\u66f8\u3044\u3066\u304f\u3060\u3055\u3044<\/pre>\n\n\n\n3. 2\u3064\u306e\u30cf\u30c3\u30b7\u30e5\u3092\u30de\u30fc\u30b8\u3057\u3066\u3001\u65b0\u3057\u3044\u30cf\u30c3\u30b7\u30e5\u3092\u4f5c\u6210\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u540c\u3058\u30ad\u30fc\u304c\u3042\u308b\u5834\u5408\u306f\u30012\u3064\u76ee\u306e\u30cf\u30c3\u30b7\u30e5\u306e\u5024\u3092\u512a\u5148\u3055\u305b\u3066\u304f\u3060\u3055\u3044\u3002<\/h4>\n\n\n\nhash1 = { a: 1, b: 2, c: 3 }\nhash2 = { b: 4, d: 5 }\n# \u3053\u3053\u306b\u30b3\u30fc\u30c9\u3092\u66f8\u3044\u3066\u304f\u3060\u3055\u3044<\/pre>\n\n\n\n\u3053\u308c\u3089\u306e\u57fa\u672c\u64cd\u4f5c\u3092\u30de\u30b9\u30bf\u30fc\u3059\u308b\u3053\u3068\u3067\u3001Ruby\u3067\u306e\u30cf\u30c3\u30b7\u30e5\u306e\u6271\u3044\u304c\u3088\u308a\u52b9\u7387\u7684\u306b\u306a\u308a\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3055\u3089\u306b\u6d17\u7df4\u3055\u308c\u305f\u30cf\u30c3\u30b7\u30e5\u306e\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u5b66\u3093\u3067\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
<\/i>3. Ruby\u3089\u3057\u3044\u6d17\u7df4\u3055\u308c\u305f\u30cf\u30c3\u30b7\u30e5\u306e\u4f7f\u3044\u65b9<\/span><\/span><\/h2>\n\n\n\nRuby\u306f\u300c\u30d7\u30ed\u30b0\u30e9\u30de\u30fc\u306e\u5e78\u305b\u300d\u3092\u91cd\u8996\u3059\u308b\u8a00\u8a9e\u3067\u3059\u3002\u3053\u306e\u7ae0\u3067\u306f\u3001Ruby\u3089\u3057\u3044\u6d17\u7df4\u3055\u308c\u305f\u30cf\u30c3\u30b7\u30e5\u306e\u4f7f\u3044\u65b9\u3092\u5b66\u3073\u3001\u3088\u308a\u52b9\u7387\u7684\u3067\u8aad\u307f\u3084\u3059\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u65b9\u6cd5\u3092\u63a2\u6c42\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
\u30b7\u30f3\u30dc\u30eb\u3092\u30ad\u30fc\u3068\u3057\u3066\u4f7f\u7528\u3059\u308b\u30e1\u30ea\u30c3\u30c8<\/h3>\n\n\n\n
\u30b7\u30f3\u30dc\u30eb\u306f\u3001Ruby\u306e\u7279\u5fb4\u7684\u306a\u6a5f\u80fd\u306e1\u3064\u3067\u3059\u3002
\u30cf\u30c3\u30b7\u30e5\u306e\u30ad\u30fc\u3068\u3057\u3066\u30b7\u30f3\u30dc\u30eb\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30e1\u30ea\u30c3\u30c8\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
\n- \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u5411\u4e0a
\u540c\u3058\u30b7\u30f3\u30dc\u30eb\u306f\u5e38\u306b\u540c\u3058\u30aa\u30d6\u30b8\u30a7\u30af\u30c8ID\u3092\u6301\u3064\u305f\u3081\u3001\u6587\u5b57\u5217\u3068\u6bd4\u3079\u3066\u30e1\u30e2\u30ea\u52b9\u7387\u304c\u826f\u304f\u3001\u6bd4\u8f03\u304c\u9ad8\u901f\u3067\u3059\u3002<\/li>\n\n\n\n - \u53ef\u8aad\u6027\u306e\u5411\u4e0a
\u30b7\u30f3\u30dc\u30eb\u306f:symbol<\/code>\u306e\u3088\u3046\u306b\u7c21\u6f54\u306b\u66f8\u3051\u308b\u305f\u3081\u3001\u30b3\u30fc\u30c9\u304c\u8aad\u307f\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/li>\n\n\n\n- \u5b89\u5168\u6027\u306e\u5411\u4e0a
\u30b7\u30f3\u30dc\u30eb\u306f\u30a4\u30df\u30e5\u30fc\u30bf\u30d6\u30eb\uff08\u5909\u66f4\u4e0d\u53ef\uff09\u306a\u306e\u3067\u3001\u610f\u56f3\u3057\u306a\u3044\u5909\u66f4\u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/li>\n<\/ol>\n\n\n\n\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u30b7\u30f3\u30dc\u30eb\u3092\u30ad\u30fc\u3068\u3057\u3066\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
# \u6587\u5b57\u5217\u3092\u30ad\u30fc\u3068\u3057\u3066\u4f7f\u7528\nuser_string = { \"name\" => \"Alice\", \"age\" => 30 }\n\n# \u30b7\u30f3\u30dc\u30eb\u3092\u30ad\u30fc\u3068\u3057\u3066\u4f7f\u7528\nuser_symbol = { name: \"Alice\", age: 30 }\n\nputs user_symbol[:name] # \u51fa\u529b: Alice<\/pre>\n\n\n\n\u30d6\u30ed\u30c3\u30af\u3092\u6d3b\u7528\u3057\u305f\u30cf\u30c3\u30b7\u30e5\u306e\u64cd\u4f5c\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n
\u30d6\u30ed\u30c3\u30af\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001\u30cf\u30c3\u30b7\u30e5\u306e\u64cd\u4f5c\u3092\u3088\u308a\u7c21\u6f54\u304b\u3064\u8868\u73fe\u529b\u8c4a\u304b\u306b\u8a18\u8ff0\u3067\u304d\u307e\u3059\u3002
\u4ee5\u4e0b\u306b\u4e3b\u8981\u306a\u30e1\u30bd\u30c3\u30c9\u3068\u305d\u306e\u4f7f\u7528\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
1. each_with_object<\/code><\/h4>\n\n\n\n\u65b0\u3057\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3057\u306a\u304c\u3089\u30cf\u30c3\u30b7\u30e5\u3092\u9806\u306b\u51e6\u7406\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
fruits = { apple: 5, banana: 3, orange: 7 }\ntotal_fruits = fruits.each_with_object(0) do |(fruit, count), total|\n total += count\nend\nputs total_fruits # \u51fa\u529b: 15<\/pre>\n\n\n\n2. select<\/code> \/ reject<\/code><\/h4>\n\n\n\n\u6761\u4ef6\u306b\u5408\u3046\u8981\u7d20\u3092\u9078\u629e\uff08\u307e\u305f\u306f\u9664\u5916\uff09\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
numbers = { a: 10, b: 20, c: 30, d: 40 }\neven_numbers = numbers.select { |key, value| value.even? }\nputs even_numbers # \u51fa\u529b: {:a=>10, :b=>20, :d=>40}<\/pre>\n\n\n\n3. map<\/code> \/ collect<\/code><\/h4>\n\n\n\n\u5404\u8981\u7d20\u3092\u5909\u63db\u3057\u3066\u65b0\u3057\u3044\u30cf\u30c3\u30b7\u30e5\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
prices = { apple: 100, banana: 80, orange: 120 }\ndiscounted_prices = prices.map { |item, price| [item, price * 0.9] }.to_h\nputs discounted_prices # \u51fa\u529b: {:apple=>90.0, :banana=>72.0, :orange=>108.0}<\/pre>\n\n\n\n4. reduce<\/code> \/ inject<\/code><\/h4>\n\n\n\n\u30cf\u30c3\u30b7\u30e5\u306e\u8981\u7d20\u3092\u96c6\u7d04\u3057\u30661\u3064\u306e\u5024\u3092\u5f97\u307e\u3059\u3002<\/p>\n\n\n\n
votes = { alice: 10, bob: 5, charlie: 7 }\ntotal_votes = votes.reduce(0) { |sum, (candidate, vote_count)| sum + vote_count }\nputs total_votes # \u51fa\u529b: 22<\/pre>\n\n\n\n\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u3067\u30b9\u30de\u30fc\u30c8\u306b\u51e6\u7406\u3092\u8a18\u8ff0\u3059\u308b<\/h3>\n\n\n\n
\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u8907\u6570\u306e\u64cd\u4f5c\u30921\u884c\u3067\u7c21\u6f54\u306b\u8a18\u8ff0\u3067\u304d\u307e\u3059\u3002
\u3053\u308c\u306b\u3088\u308a\u3001\u4e2d\u9593\u5909\u6570\u3092\u6e1b\u3089\u3057\u3001\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u3092\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
\u4f8b\u3048\u3070\u3001\u30e6\u30fc\u30b6\u30fc\u30c7\u30fc\u30bf\u304b\u308920\u4ee3\u306e\u5973\u6027\u306e\u540d\u524d\u3092\u62bd\u51fa\u3059\u308b\u51e6\u7406\u3092\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
users = [\n { name: \"Alice\", age: 25, gender: :female },\n { name: \"Bob\", age: 30, gender: :male },\n { name: \"Charlie\", age: 22, gender: :male },\n { name: \"Diana\", age: 27, gender: :female }\n]\n\nyoung_female_names = users\n .select { |user| user[:age] >= 20 && user[:age] < 30 }\n .select { |user| user[:gender] == :female }\n .map { |user| user[:name] }\n\nputs young_female_names # \u51fa\u529b: [\"Alice\", \"Diana\"]<\/pre>\n\n\n\n\u3053\u306e\u3088\u3046\u306b\u3001\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001\u30c7\u30fc\u30bf\u306e\u7d5e\u308a\u8fbc\u307f\u3068\u5909\u63db\u3092\u7c21\u6f54\u306b\u8868\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u4f8b<\/h3>\n\n\n\n1. \u30c7\u30fc\u30bf\u306e\u96c6\u8a08\u3068\u5206\u6790<\/h4>\n\n\n\n
\u58f2\u4e0a\u30c7\u30fc\u30bf\u3092\u96c6\u8a08\u3059\u308b\u4f8b<\/p>\n\n\n\n
sales_data = [\n { date: \"2023-05-01\", product: \"A\", amount: 100 },\n { date: \"2023-05-01\", product: \"B\", amount: 200 },\n { date: \"2023-05-02\", product: \"A\", amount: 150 },\n { date: \"2023-05-02\", product: \"B\", amount: 300 }\n]\n\ndaily_sales = sales_data\n .group_by { |sale| sale[:date] }\n .transform_values { |sales| sales.sum { |sale| sale[:amount] } }\n\nputs daily_sales\n# \u51fa\u529b: {\"2023-05-01\"=>300, \"2023-05-02\"=>450}<\/pre>\n\n\n\n2. \u8907\u96d1\u306a\u30c7\u30fc\u30bf\u69cb\u9020\u306e\u64cd\u4f5c<\/h4>\n\n\n\n
\u30cd\u30b9\u30c8\u3055\u308c\u305f\u30cf\u30c3\u30b7\u30e5\u3092\u64cd\u4f5c\u3059\u308b\u4f8b<\/p>\n\n\n\n
config = {\n database: {\n production: { host: \"db.example.com\", port: 5432 },\n development: { host: \"localhost\", port: 5432 }\n },\n api: {\n endpoint: \"https:\/\/api.example.com\",\n version: \"v1\"\n }\n}\n\ndef get_config(config, *keys)\n keys.reduce(config) { |acc, key| acc[key] if acc }\nend\n\nputs get_config(config, :database, :production, :host) # \u51fa\u529b: db.example.com\nputs get_config(config, :api, :version) # \u51fa\u529b: v1<\/pre>\n\n\n\n\u3053\u308c\u3089\u306e\u6d17\u7df4\u3055\u308c\u305f\u4f7f\u3044\u65b9\u3092\u30de\u30b9\u30bf\u30fc\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u300cRuby\u3089\u3057\u3044\u300d\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002
Ruby\u3089\u3057\u3044\u30b3\u30fc\u30c9\u3068\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u7279\u5fb4\u3092\u6301\u3061\u307e\u3059\u3002<\/p>\n\n\n\n
\n- \u7c21\u6f54\u3055\u3092\u91cd\u8996
\u4e0d\u8981\u306a\u5197\u9577\u6027\u3092\u6392\u9664\u3057\u3001\u6700\u5c0f\u9650\u306e\u30b3\u30fc\u30c9\u3067\u6700\u5927\u9650\u306e\u52b9\u679c\u3092\u5f97\u308b\u3053\u3068\u3092\u76ee\u6307\u3057\u307e\u3059\u3002<\/li>\n\n\n\n - \u81ea\u7136\u8a00\u8a9e\u306b\u8fd1\u3044\u8868\u73fe
\u30e1\u30bd\u30c3\u30c9\u540d\u3084\u5909\u6570\u540d\u3092\u81ea\u7136\u306a\u82f1\u8a9e\u306b\u8fd1\u3065\u3051\u308b\u3053\u3068\u3067\u3001\u30b3\u30fc\u30c9\u306e\u610f\u56f3\u3092\u660e\u78ba\u306b\u4f1d\u3048\u307e\u3059\u3002<\/li>\n\n\n\n - \u30e1\u30bd\u30c3\u30c9\u540d\u306e\u547d\u540d\u898f\u5247
\u8ff0\u8a9e\u30e1\u30bd\u30c3\u30c9\uff08\u771f\u507d\u5024\u3092\u8fd4\u3059\u30e1\u30bd\u30c3\u30c9\uff09\u306f\u672b\u5c3e\u306b ?<\/code> \u3092\u4ed8\u3051\u308b\u306a\u3069\u3001Ruby\u306e\u6163\u7fd2\u306b\u5f93\u3044\u307e\u3059\u3002<\/li>\n<\/ol>\n\n\n\nRuby\u3089\u3057\u3044\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u4f8b<\/h3>\n\n\n\n
\u4ee5\u4e0b\u306b\u3001\u3053\u308c\u307e\u3067\u5b66\u3093\u3060\u30c6\u30af\u30cb\u30c3\u30af\u3092\u7d44\u307f\u5408\u308f\u305b\u305f\u3001Ruby\u3089\u3057\u3044\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
class BookStore\n def initialize\n @books = [\n { title: \"Ruby Programming\", author: \"Matz\", price: 2500, stock: 5 },\n { title: \"Python Basics\", author: \"Guido\", price: 2000, stock: 3 },\n { title: \"JavaScript Essentials\", author: \"Eich\", price: 2200, stock: 4 }\n ]\n end\n\n def expensive_books(threshold = 2000)\n @books.select { |book| book[:price] > threshold }\n .map { |book| book[:title] }\n end\n\n def total_inventory_value\n @books.sum { |book| book[:price] * book[:stock] }\n end\n\n def find_book(title)\n @books.find { |book| book[:title].downcase.include?(title.downcase) }\n end\n\n def in_stock?(title)\n book = find_book(title)\n book && book[:stock] > 0\n end\nend\n\nstore = BookStore.new\n\nputs \"Expensive books: #{store.expensive_books}\"\nputs \"Total inventory value: #{store.total_inventory_value}\"\nputs \"Is 'Ruby Programming' in stock? #{store.in_stock?('Ruby Programming')}\"\nputs \"Book details: #{store.find_book('python')}\"<\/pre>\n\n\n\n\u3053\u306e\u30b3\u30fc\u30c9\u3067\u306f<\/p>\n\n\n\n
\nexpensive_books<\/code> \u30e1\u30bd\u30c3\u30c9\u3067 select<\/code> \u3068 map<\/code> \u3092\u4f7f\u7528\u3057\u3066\u3001\u9ad8\u4fa1\u306a\u672c\u306e\u30bf\u30a4\u30c8\u30eb\u30ea\u30b9\u30c8\u3092\u751f\u6210\u3057\u3066\u3044\u307e\u3059\u3002<\/li>\n\n\n\ntotal_inventory_value<\/code> \u30e1\u30bd\u30c3\u30c9\u3067 sum<\/code> \u3092\u4f7f\u7528\u3057\u3066\u3001\u5728\u5eab\u306e\u7dcf\u984d\u3092\u8a08\u7b97\u3057\u3066\u3044\u307e\u3059\u3002<\/li>\n\n\n\nfind_book<\/code> \u30e1\u30bd\u30c3\u30c9\u3067 find<\/code> \u3092\u4f7f\u7528\u3057\u3066\u3001\u30bf\u30a4\u30c8\u30eb\u306b\u57fa\u3065\u3044\u3066\u672c\u3092\u691c\u7d22\u3057\u3066\u3044\u307e\u3059\u3002<\/li>\n\n\n\nin_stock?<\/code> \u30e1\u30bd\u30c3\u30c9\u306f\u8ff0\u8a9e\u30e1\u30bd\u30c3\u30c9\u3068\u3057\u3066\u5b9a\u7fa9\u3055\u308c\u3001\u672c\u304c\u5728\u5eab\u306b\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u8fd4\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n\n\n\n\u3053\u308c\u3089\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001\u30b3\u30fc\u30c9\u306f\u3088\u308a\u8aad\u307f\u3084\u3059\u304f\u3001\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u3057\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002\u307e\u305f\u3001Ruby\u306e\u7279\u5fb4\u7684\u306a\u6a5f\u80fd\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u4ed6\u306e\u8a00\u8a9e\u3067\u306f\u8907\u6570\u884c\u3092\u8981\u3059\u308b\u51e6\u7406\u30921\u884c\u3067\u8868\u73fe\u3067\u304d\u308b\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
\u307e\u3068\u3081<\/h3>\n\n\n\n
Ruby\u3089\u3057\u3044\u6d17\u7df4\u3055\u308c\u305f\u30cf\u30c3\u30b7\u30e5\u306e\u4f7f\u3044\u65b9\u3092\u8eab\u306b\u3064\u3051\u308b\u3053\u3068\u3067\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5229\u70b9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
\n- \u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u304c\u5411\u4e0a\u3057\u3001\u4ed6\u306e\u958b\u767a\u8005\u3068\u306e\u30b3\u30e9\u30dc\u30ec\u30fc\u30b7\u30e7\u30f3\u304c\u30b9\u30e0\u30fc\u30ba\u306b\u306a\u308a\u307e\u3059\u3002<\/li>\n\n\n\n
- \u51e6\u7406\u52b9\u7387\u304c\u5411\u4e0a\u3057\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u6539\u5584\u3055\u308c\u307e\u3059\u3002<\/li>\n\n\n\n
- \u3088\u308a\u5c11\u306a\u3044\u30b3\u30fc\u30c9\u884c\u6570\u3067\u591a\u304f\u306e\u6a5f\u80fd\u3092\u5b9f\u73fe\u3067\u304d\u308b\u305f\u3081\u3001\u30d0\u30b0\u306e\u6f5c\u5728\u7684\u306a\u767a\u751f\u6e90\u3092\u6e1b\u3089\u305b\u307e\u3059\u3002<\/li>\n\n\n\n
- Ruby\u306e\u54f2\u5b66\u3067\u3042\u308b\u300c\u30d7\u30ed\u30b0\u30e9\u30de\u30fc\u306e\u5e78\u305b\u300d\u3092\u4f53\u73fe\u3057\u3001\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u304c\u3088\u308a\u697d\u3057\u304f\u306a\u308a\u307e\u3059\u3002<\/li>\n<\/ol>\n\n\n\n
\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u77e5\u8b58\u3092\u6d3b\u304b\u3057\u305f\u5b9f\u8df5\u7684\u306a\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u4f8b\u3092\u898b\u3066\u3044\u304d\u307e\u3059\u3002\u30cf\u30c3\u30b7\u30e5\u3092\u4f7f\u3063\u3066\u5b9f\u969b\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u3069\u306e\u3088\u3046\u306b\u554f\u984c\u3092\u89e3\u6c7a\u3067\u304d\u308b\u304b\u3001\u5177\u4f53\u7684\u306a\u30b1\u30fc\u30b9\u30b9\u30bf\u30c7\u30a3\u3092\u901a\u3058\u3066\u5b66\u3093\u3067\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
<\/i>4. \u30cf\u30c3\u30b7\u30e5\u3092\u4f7f\u3063\u305f\u5b9f\u8df5\u7684\u306a\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u4f8b<\/span><\/span><\/h2>\n\n\n\n\u3053\u3053\u307e\u3067\u3067\u5b66\u3093\u3060\u30cf\u30c3\u30b7\u30e5\u306e\u57fa\u672c\u3068\u6d17\u7df4\u3055\u308c\u305f\u4f7f\u3044\u65b9\u3092\u3001\u5b9f\u969b\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b7\u30ca\u30ea\u30aa\u306b\u9069\u7528\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002
\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u30013\u3064\u306e\u5b9f\u8df5\u7684\u306a\u4f8b\u3092\u901a\u3058\u3066\u3001\u30cf\u30c3\u30b7\u30e5\u306e\u5f37\u529b\u3055\u3068\u67d4\u8edf\u6027\u3092\u4f53\u9a13\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
\u30c7\u30fc\u30bf\u306e\u96c6\u8a08\u3068\u5206\u6790\uff1a\u58f2\u4e0a\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0\u306e\u5b9f\u88c5<\/h3>\n\n\n\n
\u307e\u305a\u3001\u5c0f\u898f\u6a21\u306a\u5e97\u8217\u306e\u58f2\u4e0a\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0\u3092\u5b9f\u88c5\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u3053\u306e\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u3001\u65e5\u5225\u30fb\u6708\u5225\u30fb\u5546\u54c1\u5225\u306e\u58f2\u4e0a\u96c6\u8a08\u3001\u58f2\u4e0a\u30c8\u30ec\u30f3\u30c9\u5206\u6790\u3001\u30d9\u30b9\u30c8\u30bb\u30e9\u30fc\u5546\u54c1\u306e\u30e9\u30f3\u30ad\u30f3\u30b0\u306a\u3069\u306e\u6a5f\u80fd\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
class SalesManagementSystem\n def initialize\n @sales_data = [\n { date: \"2023-05-01\", product: \"A\", amount: 100 },\n { date: \"2023-05-01\", product: \"B\", amount: 200 },\n { date: \"2023-05-02\", product: \"A\", amount: 150 },\n { date: \"2023-05-02\", product: \"C\", amount: 300 },\n { date: \"2023-06-01\", product: \"B\", amount: 400 },\n { date: \"2023-06-02\", product: \"A\", amount: 200 },\n { date: \"2023-06-02\", product: \"C\", amount: 250 }\n ]\n end\n\n def daily_sales\n @sales_data.group_by { |sale| sale[:date] }\n .transform_values { |sales| sales.sum { |sale| sale[:amount] } }\n end\n\n def monthly_sales\n @sales_data.group_by { |sale| sale[:date][0..6] }\n .transform_values { |sales| sales.sum { |sale| sale[:amount] } }\n end\n\n def product_sales\n @sales_data.group_by { |sale| sale[:product] }\n .transform_values { |sales| sales.sum { |sale| sale[:amount] } }\n end\n\n def best_selling_products(top_n = 3)\n product_sales.sort_by { |_, amount| -amount }.first(top_n).to_h\n end\n\n def sales_trend\n daily_sales.sort_by { |date, _| date }.to_h\n end\nend\n\n# \u4f7f\u7528\u4f8b\nsms = SalesManagementSystem.new\nputs \"\u65e5\u5225\u58f2\u4e0a: #{sms.daily_sales}\"\nputs \"\u6708\u5225\u58f2\u4e0a: #{sms.monthly_sales}\"\nputs \"\u5546\u54c1\u5225\u58f2\u4e0a: #{sms.product_sales}\"\nputs \"\u30d9\u30b9\u30c8\u30bb\u30e9\u30fc\u5546\u54c1 (\u4e0a\u4f4d3\u3064): #{sms.best_selling_products}\"\nputs \"\u58f2\u4e0a\u30c8\u30ec\u30f3\u30c9: #{sms.sales_trend}\"<\/pre>\n\n\n\n\u3053\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001group_by<\/code>\u3001transform_values<\/code>\u3001sum<\/code>\u3001sort_by<\/code> \u306a\u3069\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u6d3b\u7528\u3057\u3066\u3001\u8907\u96d1\u306a\u96c6\u8a08\u51e6\u7406\u3092\u7c21\u6f54\u306b\u8a18\u8ff0\u3057\u3066\u3044\u307e\u3059\u3002
\u7279\u306b\u6ce8\u76ee\u3059\u3079\u304d\u70b9\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n\ndaily_sales<\/code> \u3068 monthly_sales<\/code> \u30e1\u30bd\u30c3\u30c9\u3067\u306f\u3001group_by<\/code> \u3092\u4f7f\u7528\u3057\u3066\u65e5\u4ed8\u307e\u305f\u306f\u6708\u3054\u3068\u306b\u30c7\u30fc\u30bf\u3092\u30b0\u30eb\u30fc\u30d7\u5316\u3057\u3001\u305d\u306e\u5f8c transform_values<\/code> \u3067\u5404\u30b0\u30eb\u30fc\u30d7\u306e\u5408\u8a08\u3092\u8a08\u7b97\u3057\u3066\u3044\u307e\u3059\u3002<\/li>\n\n\n\nbest_selling_products<\/code> \u30e1\u30bd\u30c3\u30c9\u3067\u306f\u3001sort_by<\/code> \u3068\u8ca0\u306e\u5024\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u964d\u9806\u3067\u306e\u30bd\u30fc\u30c8\u3092\u5b9f\u73fe\u3057\u3066\u3044\u307e\u3059\u3002<\/li>\n\n\n\nsales_trend<\/code> \u30e1\u30bd\u30c3\u30c9\u3067\u306f\u3001sort_by<\/code> \u3092\u4f7f\u7528\u3057\u3066\u65e5\u4ed8\u9806\u306b\u30c7\u30fc\u30bf\u3092\u4e26\u3079\u66ff\u3048\u3066\u3044\u307e\u3059\u3002<\/li>\n<\/ul>\n\n\n\nAPI\u30ec\u30b9\u30dd\u30f3\u30b9\u306e\u52b9\u7387\u7684\u306a\u51e6\u7406\u65b9\u6cd5<\/h3>\n\n\n\n
\u6b21\u306b\u3001\u5916\u90e8API\u304b\u3089\u306eJSON\u30ec\u30b9\u30dd\u30f3\u30b9\u3092\u51e6\u7406\u3059\u308b\u30b7\u30ca\u30ea\u30aa\u3092\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002
\u3053\u3053\u3067\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\u3057\u3001\u5fc5\u8981\u306a\u60c5\u5831\u3092\u62bd\u51fa\u3059\u308b\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
require 'json'\nrequire 'ostruct'\n\nclass UserDataProcessor\n def initialize(json_data)\n @data = JSON.parse(json_data, symbolize_names: true)\n end\n\n def process_users\n @data[:users].map do |user|\n OpenStruct.new(\n id: user[:id],\n full_name: \"#{user[:first_name]} #{user[:last_name]}\",\n email: user[:email],\n active: user[:status] == 'active'\n )\n end\n end\n\n def find_user(id)\n process_users.find { |user| user.id == id }\n end\n\n def active_users\n process_users.select(&:active)\n end\n\n def user_emails\n process_users.map(&:email)\n end\nend\n\n# \u4f7f\u7528\u4f8b\njson_data = <<-JSON\n{\n \"users\": [\n {\"id\": 1, \"first_name\": \"Alice\", \"last_name\": \"Smith\", \"email\": \"alice@example.com\", \"status\": \"active\"},\n {\"id\": 2, \"first_name\": \"Bob\", \"last_name\": \"Johnson\", \"email\": \"bob@example.com\", \"status\": \"inactive\"},\n {\"id\": 3, \"first_name\": \"Charlie\", \"last_name\": \"Brown\", \"email\": \"charlie@example.com\", \"status\": \"active\"}\n ]\n}\nJSON\n\nprocessor = UserDataProcessor.new(json_data)\nputs \"\u5168\u30e6\u30fc\u30b6\u30fc: #{processor.process_users}\"\nputs \"\u30e6\u30fc\u30b6\u30fcID 2: #{processor.find_user(2)}\"\nputs \"\u30a2\u30af\u30c6\u30a3\u30d6\u30e6\u30fc\u30b6\u30fc: #{processor.active_users}\"\nputs \"\u5168\u30e6\u30fc\u30b6\u30fc\u306e\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9: #{processor.user_emails}\"<\/pre>\n\n\n\n\u3053\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001\u4ee5\u4e0b\u306e\u30dd\u30a4\u30f3\u30c8\u306b\u6ce8\u76ee\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n