{"id":19219,"date":"2017-03-05T00:54:13","date_gmt":"2017-03-04T15:54:13","guid":{"rendered":"http:\/\/www.sejuku.net\/blog\/?p=19219"},"modified":"2024-05-06T11:40:40","modified_gmt":"2024-05-06T02:40:40","slug":"ruby-inject-%e5%9f%ba%e7%a4%8e%e3%81%8b%e3%82%89%e5%bf%9c%e7%94%a8%e3%81%be%e3%81%a7%e3%81%ae4%e3%81%a4%e3%81%aetips","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/19219","title":{"rendered":"\u3010Ruby\u5165\u9580\u3011inject\u306e\u4f7f\u3044\u65b9\u3092\u308f\u304b\u308a\u3084\u3059\u304f\u307e\u3068\u3081\u3066\u307f\u305f\uff01"},"content":{"rendered":"

\u3053\u3093\u306b\u3061\u306f\uff01Web\u30b3\u30fc\u30c0\u30fc\u30fb\u30d7\u30ed\u30b0\u30e9\u30de\u30fc\u306e\u8c9d\u539f\uff08@touhicomu<\/a>\uff09\u3067\u3059\u3002<\/p>\n

Ruby\u3067\u306f\u7e70\u308a\u8fd4\u3057\u3092\u884c\u3046\u51e6\u7406\u304c\u3044\u304f\u3064\u304b\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u304c\u3001<\/p>\n

inject<\/strong><\/span>\u306f\u30d6\u30ed\u30c3\u30af\u3092\u4f7f\u7528\u3057\u3066\u7e70\u308a\u8fd4\u3057\u51e6\u7406<\/strong><\/span>\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n

\u4eca\u65e5\u306f\u3001Ruby\u306einject\u306b\u3064\u3044\u3066\u4ee5\u4e0b\u306e\u5185\u5bb9\u3067\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n

\n\u3010\u57fa\u790e\u3011<\/strong><\/span>inject\u3068\u306f
\n\u3010\u57fa\u790e\u3011<\/strong><\/span>inject\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9
\n\u3010\u57fa\u790e\u3011<\/strong><\/span>inject\u306b\u521d\u671f\u5024\u3092\u8a2d\u5b9a\u3059\u308b
\n\u3010\u767a\u5c55\u3011<\/strong><\/span>inject\u306b\u30b7\u30f3\u30dc\u30eb\u3092\u4f7f\u3063\u3066\u6f14\u7b97\u5b50\u3092\u6307\u5b9a\u3059\u308b
\n\u3010\u767a\u5c55\u3011<\/strong><\/span>\u6761\u4ef6\u3092\u6307\u5b9a\u3057\u3066\u3001hash\u304b\u3089\u914d\u5217\u3092\u4f5c\u6210\u3059\u308b\n<\/div>\n

\u307e\u305f\u3001inject\u306e\u6982\u5ff5\u306f\u5c11\u3005\u308f\u304b\u308a\u3065\u3089\u3044\u305f\u3081\u3001each\u3067inject\u3068\u540c\u7b49\u306e\u51e6\u7406\u3092\u884c\u3046\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3082\u7d39\u4ecb\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n

\u3053\u306e\u30da\u30fc\u30b8\u3067\u3001Ruby\u306einject\u306e\u4f7f\u3044\u65b9\u3092\u3088\u304f\u628a\u63e1\u3057\u3066\u81ea\u5206\u306e\u30b9\u30ad\u30eb\u3068\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n

inject\u3068\u306f\uff1f<\/h2>\n

inject<\/strong><\/span>\u306feach\u3084map\u3068\u540c\u3058\u3088\u3046\u306b\u7e70\u308a\u8fd4\u3057\u3092\u884c\u3046\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002<\/p>\n

\u30d6\u30ed\u30c3\u30af\u3092\u4f7f\u3063\u3066\u7e70\u308a\u8fd4\u3057\u8a08\u7b97\u3092\u884c\u3046\u3053\u3068\u304c\u7279\u5fb4\u3067\u3001<\/p>\n

\u914d\u5217\u30aa\u30d6\u30b8\u30a7\u30af\u30c8.inject {|\u521d\u671f\u5024, \u8981\u7d20| \u30d6\u30ed\u30c3\u30af\u51e6\u7406 }<\/pre>\n
\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n
\u7e70\u308a\u8fd4\u3057\u9806\u306b\u30d6\u30ed\u30c3\u30af\u306e\u8981\u7d20\u304c\u914d\u5217\u5206\u52a0\u7b97\u3055\u308c\u3066\u3044\u304d\u3001\u30d6\u30ed\u30c3\u30af\u306e\u51e6\u7406\u306b\u3066\u8a08\u7b97\u3092\u884c\u3063\u3066\u3044\u304d\u307e\u3059\u3002<\/strong><\/span><\/p>\n
\u307e\u3060\u30d4\u30f3\u3068\u3053\u306a\u3044\u65b9\u3082\u3044\u308b\u3068\u601d\u3044\u307e\u3059\u306e\u3067\u6b21\u9805\u3067\u5b9f\u969b\u306b\u4f7f\u3044\u65b9\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n
inject\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<\/h2>\n
\u914d\u5217\u306e\u5408\u8a08\u3092\u7b97\u51fa\u3059\u308b<\/h3>\n
\u305d\u308c\u3067\u306finject<\/strong><\/span>\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n
inject\u306f\u76f4\u611f\u7684\u306b\u308f\u304b\u308a\u306b\u304f\u3044\u306e\u3067\u3001\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u6319\u52d5\u3092\u78ba\u8a8d\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n
[inject\u3092\u4f7f\u3063\u3066\u914d\u5217\u306e\u4e2d\u8eab\u306e\u5408\u8a08\u3092\u7b97\u51fa\u3059\u308b]<\/strong><\/p>\n
array = 1..6\r\narray.inject (0){ |sum,num| p sum+=num}<\/pre>\n
 [\u5b9f\u884c\u7d50\u679c]<\/strong><\/p>\n
1\r\n3\r\n6\r\n10\r\n15\r\n21<\/pre>\n
\u4e0a\u8a18inject\u3068\u540c\u7b49\u306e\u51e6\u7406\u3092\u884c\u3046each\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n
array = 1..6\r\n\r\n#\u4ee5\u4e0b\u306einject\u3068\u540c\u7b49\u306e\u51e6\u7406\u3092each\u3067\u5b9f\u884c\u3057\u307e\u3059\u3002\r\n#array.inject (0){ |sum,num| p sum+=num}\r\n\r\nsum = 0\r\narray.each do |num|\r\n  sum += num\r\n  p sum\r\nend<\/pre>\n
[\u5b9f\u884c\u7d50\u679c]<\/strong><\/p>\n
1\r\n3\r\n6\r\n10\r\n15\r\n21<\/pre>\n
inject\u306f\u7b2c1\u5f15\u6570\u306binject\u304c\u5185\u90e8\u3067\u4fdd\u6301\u3057\u3066\u3044\u308b\u5909\u6570\u306e\u521d\u671f\u5024<\/strong><\/span>\u3092\u8a2d\u5b9a\u3067\u304d\u3066\u3001\u305d\u306e\u5185\u90e8\u5909\u6570\u304c\u30d6\u30ed\u30c3\u30af\u306e\u7b2c1\u30d6\u30ed\u30c3\u30af\u5909\u6570\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u4eca\u56de\u306e\u5834\u5408\u306fsum\u304c\u7b2c1\u30d6\u30ed\u30c3\u30af\u5909\u6570\u3067\u3001\u59cb\u3081\u306b\u521d\u671f\u50240\u304c\u4ee3\u5165\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
each\u306e\u5834\u5408\u306f\u3001\u5909\u6570sum\u306b0\u3092\u4ee3\u5165\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u307e\u305f\u3001\u30d6\u30ed\u30c3\u30af\u5f15\u6570<\/strong><\/span>\u306f\u7b2c2\u5f15\u6570\u4ee5\u964d\u3067\u53d6\u5f97\u3067\u304d\u307e\u3059\u3002\u4eca\u56de\u30d6\u30ed\u30c3\u30af\u306e\u7b2c2\u5f15\u6570\u306f\u3001array\u306e\u8981\u7d20<\/strong><\/span>\u3067\u3059\u306e\u3067num\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u30d6\u30ed\u30c3\u30af\u306e\u7b2c1\u30d6\u30ed\u30c3\u30af\u5909\u6570\u306fsum\u3067\u3059\u304c\u3001\u3053\u308c\u306finject\u306e\u7b2c1\u5f15\u6570\u3067\u521d\u671f\u5316\u3055\u308c\u305f\u5909\u6570\u3067\u3001inject\u30e1\u30bd\u30c3\u30c9\u304c\u5185\u90e8\u3067\u6301\u3063\u3066\u3044\u308b\u5909\u6570<\/strong><\/span>\u3067\u3059\u3002<\/p>\n
each\u306e\u4f8b\u3067\u306f\u3001each\u306e\u30d6\u30ed\u30c3\u30af\u306e\u5916\u90e8\u306e\u5909\u6570sum<\/strong><\/span>\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u3053\u308c\u306f\u3001erach\u306finject\u3068\u306f\u9055\u3063\u3066\u3001\u5185\u90e8\u306b\u5909\u6570\u3092\u6301\u3063\u3066\u3044\u306a\u3044\u305f\u3081\u3001\u5916\u90e8\u3067\u5909\u6570sum\u3092\u7528\u610f\u3057\u306a\u3044\u3068\u3044\u3051\u306a\u3044\u305f\u3081\u3067\u3059\u3002<\/p>\n
\u305d\u3057\u3066\u3001\u3053\u306e\u4f8b\u3067\u306f\u8981\u7d20num\u304c\u9806\u756a\u306bsum\u306b\u52a0\u7b97\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u3053\u308c\u306f\u3001inject\u3067\u3082each\u3067\u3082\u540c\u3058\u51e6\u7406\u3067\u3059\u306d\u3002<\/p>\n
\u305d\u3057\u3066\u3001inject\u3067\u3082each\u3067\u3082p\u30e1\u30bd\u30c3\u30c9\u3067\u3001\u5909\u6570sum\u306e\u8a08\u7b97\u904e\u7a0b\u3092\u8868\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u3082\u3046\u4e00\u5ea6\u7e70\u308a\u8fd4\u3057\u307e\u3059\u304c\u3001inject\u306f\u82f1\u8a9e\u3067\u3001\u6ce8\u5165\u3059\u308b\u3068\u3044\u3046\u610f\u5473\u3092\u6301\u3061\u307e\u3059\u3002<\/p>\n
\u306a\u306e\u3067\u3001sum\u306barray\u306e\u8981\u7d20\u3067\u3042\u308bnum\u304c\u9806\u756a\u306b\u6ce8\u5165\u3055\u308c\u3066\u3044\u304f\u30a4\u30e1\u30fc\u30b8\u304c\u3042\u308b\u3068\u7406\u89e3\u3057\u3084\u3059\u3044\u3067\u3059\u3002<\/strong><\/span><\/p>\n
\u307e\u305f\u3001\u4e0a\u8a18\uff12\u3064\u306e\u4f8b\u306e\u3088\u3046\u306b\u3001each\u306f\u5c11\u3057\u5197\u9577\u306a\u66f8\u304d\u65b9<\/strong><\/span>\u3067inject\u306e\u65b9\u304c\u7c21\u6f54\u306b\u66f8\u3051\u3066\u30a8\u30ec\u30ac\u30f3\u30c8\u3067\u3059\u3002<\/p>\n
\u305f\u3060\u3001\u4f55\u3092\u3084\u3063\u3066\u3044\u308b\u306e\u304b\u306f\u3001each\u30e1\u30bd\u30c3\u30c9\u306e\u65b9\u304c\u308f\u304b\u308a\u3084\u3059\u3044\u3067\u3059\u3002<\/p>\n
inject\u306b\u306a\u308c\u3066\u304d\u305f\u3089\u3001inject\u3092\u66f8\u3044\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n
inject\u306b\u521d\u671f\u5024\u3092\u8a2d\u5b9a\u3059\u308b<\/h2>\n
inject\u306b\u306f\u3055\u304d\u307b\u30690\u3092\u521d\u671f\u5024\u3068\u3057\u305f\u3088\u3046\u306b\u3001\u521d\u671f\u5024\u3092\u8a2d\u5b9a<\/strong><\/span>\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
array = 1..6\r\narray.inject (6){ |sum,num| p sum+=num}<\/pre>\n
 [\u5b9f\u884c\u7d50\u679c]<\/strong><\/p>\n
7\r\n9\r\n12\r\n16\r\n21\r\n27<\/pre>\n
\u3053\u308c\u3092\u3001each\u3067\u66f8\u304f\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
array = 1..6\r\n\r\n#\u4ee5\u4e0b\u306einject\u3068\u540c\u7b49\u306e\u51e6\u7406\u3092each\u3067\u5b9f\u884c\u3057\u307e\u3059\u3002\r\n#array.inject (6){ |sum,num| p sum+=num}\r\n\r\nsum = 6\r\narray.each do |num|\r\n  sum += num\r\n  p sum\r\nend<\/pre>\n
[\u5b9f\u884c\u7d50\u679c]<\/strong><\/p>\n
7\r\n9\r\n12\r\n16\r\n21\r\n27<\/pre>\n
\u521d\u671f\u5024\u3092\u8a2d\u5b9a\u3057\u305f\u7d50\u679c\u3001\u3055\u304d\u307b\u3069\u3068\u6bd4\u3079\u3066\u3001\u5168\u4f53\u7684\u306b\u521d\u671f\u50246<\/strong><\/span>\u3060\u3051\u5927\u304d\u304f\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n
nject\u306e\u7b2c1\u5f15\u65706\u3067\u3001inject\u306e\u5185\u90e8\u5909\u6570\u304c6\u306b\u521d\u671f\u5316<\/strong><\/span>\u3055\u308c\u305f\u305f\u3081\u3067\u3059\u3002<\/p>\n
\u305d\u306e\u5f8c\u3001inject\u306e\u30d6\u30ed\u30c3\u30af\u5909\u6570sum\u306binject\u306e\u5185\u90e8\u5909\u6570\u304c\u6e21\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u3064\u307e\u308a\u3001\u30d6\u30ed\u30c3\u30af\u5909\u6570sum\u306e\u521d\u671f\u5024\u306f6\u3067\u3059\u3002<\/p>\n
each\u306e\u65b9\u3067\u3082\u3001sum\u306e\u521d\u671f\u5024\u30920\u304b\u30896\u306b\u5909\u66f4\u3057\u305f\u3060\u3051\u3067\u3059\u306d\u3002<\/p>\n
inject\u306b\u30b7\u30f3\u30dc\u30eb\u3092\u4f7f\u3063\u3066\u6f14\u7b97\u5b50\u3092\u6307\u5b9a\u3059\u308b<\/h2>\n
inject\u306b\u6f14\u7b97\u5b50<\/strong><\/span>\u3092\u30b7\u30f3\u30dc\u30eb<\/strong><\/span>\u3067\u6e21\u3059\u3053\u3068\u3067\u3001\u3088\u308a\u30b9\u30bf\u30a4\u30ea\u30c3\u30b7\u30e5\u306binject\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u4f8b\u3048\u3070\u3001<\/p>\n
    \n
  • \u914d\u5217\u306e\u4e2d\u8eab\u306e\u5408\u8a08\u3092\u7b97\u51fa\u3057\u305f\u3044<\/li>\n
  • \u5168\u90e8\u639b\u3051\u5408\u308f\u305b\u305f\u5024\u3092\u8a08\u7b97\u3057\u305f\u3044<\/li>\n
  • \u914d\u5217\u306e\u4e2d\u8eab\u3092\u4f7f\u3063\u3066\u9806\u756a\u306b\u5f15\u304d\u7b97\u3092\u3057\u305f\u3044<\/li>\n<\/ul>\n
    \u306a\u3069\u3055\u307e\u3056\u307e\u306a\u5834\u9762\u3067\u4f7f\u7528\u53ef\u80fd\u3067\u3059\u3002<\/p>\n
    array = 1..6\r\np array.inject(:+) #\u914d\u5217\u306e\u8981\u7d20\u3092\u3059\u3079\u3066\u8db3\u3059\r\np array.inject(3,:+) #\u521d\u671f\u50243\u306b\u5bfe\u3057\u3066\u3001\u914d\u5217\u306e\u8981\u7d20\u3092\u3059\u3079\u3066\u8db3\u3059\r\np array.inject(:*) #\u914d\u5217\u306e\u8981\u7d20\u3092\u3059\u3079\u3066\u639b\u3051\u308b\r\np array.inject(3,:*) #\u521d\u671f\u50243\u306b\u5bfe\u3057\u3066\u3001\u914d\u5217\u306e\u8981\u7d20\u3092\u3059\u3079\u3066\u639b\u3051\u308b\r\np array.inject(100,:-) #100\u304b\u3089array\u306e\u5408\u8a08\u5024\u3092\u5f15\u304f<\/pre>\n
    [\u5b9f\u884c\u7d50\u679c]<\/strong><\/p>\n
    21\r\n24\r\n720\r\n2160\r\n79<\/pre>\n
    \u3053\u306e\u3088\u3046\u306b\u30b7\u30f3\u30dc\u30eb\u3067\u6307\u5b9a\u3057\u305f\u6f14\u7b97\u5b50\u3067\u3001\u914d\u5217\u306e\u4e2d\u8eab\u304c\u9806\u756a\u306b\u521d\u671f\u5024\u306b\u5bfe\u3057\u3066\u6f14\u7b97\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n
    \u3053\u308c\u3092\u3001each\u3067\u66f8\u3044\u3066\u307f\u308b\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
    #p array.inject(:+) #\u914d\u5217\u306e\u8981\u7d20\u3092\u3059\u3079\u3066\u8db3\u3059\r\ndef sumope( array, init_value, ope )\r\n    sum = init_value\r\n    array.each do |num|\r\n      sum = ope.to_proc.call(sum, num)\r\n      p sum\r\n    end\r\nend\r\n\r\narray = 1..6\r\nsum = 6\r\nsumope( array, sum, :+ )\r\n <\/pre>\n
    [\u5b9f\u884c\u7d50\u679c]<\/strong><\/p>\n
    7\r\n9\r\n12\r\n16\r\n21\r\n27<\/pre>\n
    \u95a2\u6570sumope\u3067\u5f15\u6570array\u3068init_value\u3001ope\u3092\u53d7\u3051\u53d6\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n
    array\u306f\u8a08\u7b97\u306b\u4f7f\u7528\u3059\u308b\u914d\u5217\u3067\u3059\u3002<\/p>\n
    init_value\u306f\u3001\u8a08\u7b97\u306b\u4f7f\u7528\u3059\u308b\u5909\u6570sum\u306e\u521d\u671f\u5024\u3067\u3059\u3002<\/p>\n
    ope\u306f\u3001\u8a08\u7b97\u30e1\u30bd\u30c3\u30c9<\/strong><\/span>\u3068\u3057\u3066\u4f7f\u7528\u3059\u308b\u30b7\u30f3\u30dc\u30eb<\/strong><\/span>\u3067\u3059\u3002<\/p>\n
    sumope\u5185\u3067\u306f\u3001sum\u306b\u521d\u671f\u5024\u3092\u4ee3\u5165\u3057\u305f\u5f8c\u3001\u914d\u5217array\u306eeach\u30e1\u30bd\u30c3\u30c9\u3067\u30eb\u30fc\u30d7\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
    \u305d\u3057\u3066\u3001\u30eb\u30fc\u30d7\u306e\u30d6\u30ed\u30c3\u30af\u5185\u3067\u3001\u30b7\u30f3\u30dc\u30ebope\uff08:+\uff09\u3092to_proc<\/strong><\/span>\u3057\u3066\u3001Proc\u306b\u5909\u63db<\/strong><\/span>\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
    \u305d\u3057\u3066\u3001Proc\u306e\u30e1\u30bd\u30c3\u30c9call<\/strong><\/span>\u3067Proc\u3092\u5b9f\u884c\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
    Proc\u306f\u3053\u306e\u5834\u5408\u3001\u300c+\u300d\u30e1\u30bd\u30c3\u30c9<\/strong><\/span>\u3067\u3059\u306e\u3067\u3001sum\u3068num\u304c\u300csum + num<\/strong><\/span>\u300d\u3055\u308c\u3066\u3001\u8a08\u7b97\u7d50\u679c\u304c\u5909\u6570sum\u306b\u4ee3\u5165\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
    \u305d\u3057\u3066\u3001\u300cp sum\u300d\u3067\u3001sum\u306e\u5185\u5bb9\u3092\u8868\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
    \u3053\u306e\u3088\u3046\u306b\u3001inject\u3067\u306f\u3001\u3044\u308d\u3044\u308d\u306a\u5197\u9577\u306a\u66f8\u304d\u65b9\u304c\u7701\u7565\u3067\u304d\u3001\u5927\u5909\u30a8\u30ec\u30ac\u30f3\u30c8\u306b\u30b3\u30fc\u30c9\u3092\u66f8\u3051\u307e\u3059\u3002<\/p>\n
    \u3053\u306e\u30a8\u30ec\u30ac\u30f3\u30c8\u3055\u306f\u3001\u3044\u304b\u306b\u3082Ruby\u3089\u3055\u3057\u3055\u3068\u8a00\u3048\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n
    each\u3067\u66f8\u304f\u5834\u5408\u306f\u3001\u30b3\u30fc\u30c9\u304c\u5c11\u3005\u5197\u9577\u306b\u306a\u308a\u307e\u3059\u304c\u3001\u30b3\u30fc\u30c9\u306e\u898b\u305f\u76ee\u304c\u308f\u304b\u308a\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n
    \u307e\u305a\u306feach\u3067\u66f8\u3044\u3066\u307f\u3066\u3001\u306a\u308c\u3066\u304d\u305f\u3089inject\u3092\u4f7f\u7528\u3059\u308b\u65b9\u304c\u826f\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n
    \u6761\u4ef6\u3092\u6307\u5b9a\u3057\u3066\u3001hash\u304b\u3089\u914d\u5217\u3092\u4f5c\u6210\u3059\u308b<\/h2>\n
    inject\u3092\u4f7f\u3063\u3066\u3001hash\u304b\u3089\u65b0\u3057\u3044\u914d\u5217\u3092\u4f5c\u6210<\/strong><\/span>\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n
    \u305d\u306e\u969b\u306b\u3001\u6761\u4ef6\u3092\u81ea\u7531\u306b\u6307\u5b9a\u3067\u304d\u307e\u3059\u3002<\/p>\n
    \u4eca\u56de\u306fhash\u306e\u4e2d\u304b\u3089\u3001value\u304c150\u4ee5\u4e0b\u306e\u3082\u306e\u306ekey\u3092\u65b0\u3057\u3044\u914d\u5217<\/strong><\/span>\u306b\u8a70\u3081\u307e\u3059\u3002<\/p>\n
    hash = {"apple" => 245, "orange"=>120, "peach"=>566, "banana" => 100}\r\nnew_array = hash.inject([]) {|new_array, (key, val)| new_array << key if val <=150; new_array}\r\np new_array\r\n<\/pre>\n
    [\u5b9f\u884c\u7d50\u679c]<\/strong><\/p>\n
    ["orange", "banana"]\r\n<\/pre>\n
    \u3053\u306e\u3088\u3046\u306b\u3001orange\u3068banana\u304c\u3057\u3063\u304b\u308a\u3068\u65b0\u3057\u3044\u914d\u5217\u3068\u3057\u3066\u53d6\u308a\u51fa\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n
    \u3053\u308c\u3092\u3001each\u3067\u66f8\u3044\u3066\u307f\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
    hash = {"apple" => 245, "orange"=>120, "peach"=>566, "banana" => 100}\r\n\r\n#\u4ee5\u4e0b\u306einject\u3068\u540c\u7b49\u306e\u51e6\u7406\u3092each\u3067\u5b9f\u884c\u3057\u307e\u3059\u3002\r\n#new_array = hash.inject([]) {|new_array, (key, val)| new_array << key if val <=150; new_array}\r\n\r\nnew_array = []\r\nhash.each do | (key, val ) |\r\n  if val <= 150\r\n    new_array << key\r\n  end\r\nend\r\n\r\np new_array<\/pre>\n
    [\u5b9f\u884c\u7d50\u679c]<\/strong><\/p>\n
    ["orange", "banana"]<\/pre>\n
    each\u3067\u306f\u3001\u307e\u305a\u3001\u5909\u6570new_array\u3092\u7a7a\u767d\u306e\u914d\u5217[]\u3067\u521d\u671f\u5316<\/strong><\/span>\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
    inject\u3067\u306f\u3001inject\u306e\u7b2c1\u5f15\u6570\u306b[]<\/strong><\/span>\u3092\u6e21\u3057\u3066\u3044\u307e\u3059\u306d\u3002<\/p>\n
    \u3053\u306einject\u306e\u7b2c1\u5f15\u6570\u3067\u3001inject\u306e\u5185\u90e8\u5909\u6570\u304c[]\u306b\u521d\u671f\u5316\u3055\u308c\u307e\u3059\u3002<\/p>\n
    \u305d\u306e\u305f\u3081\u3001inject\u306e\u30d6\u30ed\u30c3\u30af\u306e\u7b2c1\u30d6\u30ed\u30c3\u30af\u5909\u6570new_array\u306e\u521d\u671f\u5024\u306f[]<\/strong><\/span>\u3067\u3059\u3002<\/p>\n
    each\u306b\u8a71\u3057\u3092\u623b\u3059\u3068\u3001\u30d6\u30ed\u30c3\u30af\u5909\u6570key\u3068val\u3092\u53d7\u3051\u53d6\u308a\u3001if\u5206\u306b\u3066\u3001\u300cval <= 150<\/strong><\/span>\u300d\u304c\u6210\u308a\u7acb\u3064\u6642\u306e\u307f\u3001\u914d\u5217new_array\u306b\u65b0\u3057\u3044\u8981\u7d20key\u3092\u8ffd\u52a0<\/strong><\/span>\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
    inject\u306e\u4f8b\u3067\u306f\u3001<\/p>\n
    \r\nnew_array << key if val <=150\r\n<\/pre>\n
    \u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n
    inject\u306e\u4f8b\u3067\u306f\u5f8c\u7f6eif\u3068\u306a\u3063\u3066\u3044\u308b\u3060\u3051\u3067\u3001\u300cval <= 150\u300d\u306a\u30cf\u30c3\u30b7\u30e5\u306e\u30ad\u30fc\u3092new_array\u306e\u8981\u7d20\u3068\u3057\u3066\u8ffd\u52a0\u3057\u3066\u3044\u308b\u51e6\u7406\u306f\u540c\u3058\u3067\u3059\u306d\u3002<\/p>\n
    each\u306e\u5b9f\u884c\u7d50\u679c\u3067\u3082\u3001\u300cval <= 150\u300d\u306a\u30cf\u30c3\u30b7\u30e5\u306e\u30ad\u30fc\u300c"orange"\u300d\u300c"banana"\u300d\u306e\u307f\u3001\u914d\u5217new_array\u306b\u4ee3\u5165\u3055\u308c\u307e\u3059\u3002<\/p>\n
    \u6700\u5f8c\u306b\u3002p\u30e1\u30bd\u30c3\u30c9\u3067\u914d\u5217new_array\u3092\u8868\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
    \u307e\u3068\u3081<\/h2>\n
    \u4eca\u56de\u306f\u3001Ruby<\/strong><\/span>\u306einject<\/strong><\/span>\u306b\u3064\u3044\u3066\u5b66\u7fd2\u3057\u307e\u3057\u305f\uff01<\/p>\n
    \u5b66\u7fd2\u306e\u30dd\u30a4\u30f3\u30c8\u3092\u632f\u308a\u8fd4\u3063\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n
    \u300cinject\u306f\u5185\u90e8\u5909\u6570\u3092\uff11\u3064\u4fdd\u6301\u3057\u3066\u30eb\u30fc\u30d7\u51e6\u7406\u3092\u884c\u3044\u3001\u30d6\u30ed\u30c3\u30af\u306e\u7b2c1\u30d6\u30ed\u30c3\u30af\u5909\u6570\u306b\u5185\u90e8\u90e8\u6570\u3092\u6e21\u3059<\/strong><\/span>\u3002\u7b2c2\u30d6\u30ed\u30c3\u30af\u5909\u6570\u306f\u30ec\u30b7\u30fc\u30d0\u306e\u8981\u7d20\u300d<\/p>\n
    \u300cinject\u306e\u30d6\u30ed\u30c3\u30af\u306e\u8fd4\u5024\u304cinject\u306e\u8fd4\u5024<\/strong><\/span>\u3068\u306a\u308b\u300d<\/p>\n
    \u300cinject\u306e\u7b2c1\u5f15\u6570\u3067\u3002inject\u306e\u5185\u90e8\u5909\u6570\u3092\u521d\u671f\u5316<\/strong><\/span>\u3067\u304d\u308b\u300d<\/p>\n
    \u300cinject\u306bProc\u306e\u30b7\u30f3\u30dc\u30eb\u3092\u6e21\u3057\u305f\u5834\u5408\u3001\u5185\u90e8\u5909\u6570\u3068\u30ec\u30b7\u30fc\u30d0\u306e\u8981\u7d20\u3092\u3001\u305d\u306eProc\u3067\u6f14\u7b97\u3057\u305f\u7d50\u679c\u3092\u8fd4\u3059<\/strong><\/span>\u300d<\/p>\n
    \u300cinject\u306e\u7b2c1\u5f15\u6570\u306b\u914d\u5217\u3092\u6e21\u3057\u305f\u5834\u5408\u3001inject\u306e\u5185\u90e8\u5909\u6570\u304c\u914d\u5217\u3067\u521d\u671f\u5316\u3055\u308c\u308b\u3002\u305d\u306e\u5185\u90e8\u5909\u6570\u306f\u30d6\u30ed\u30c3\u30af\u306e\u7b2c1\u5f15\u6570\u306b\u6e21\u3055\u308c\u308b\u3002\u305d\u306e\u305f\u3081\u3002\u30d6\u30ed\u30c3\u30af\u306b\u3066inject\u306e\u5185\u90e8\u5909\u6570\u3067\u3042\u308b\u914d\u5217\u3092\u52a0\u5de5<\/strong><\/span>\u3067\u304d\u308b\u300d<\/p>\n
    \u4ee5\u4e0a\u306e\u5185\u5bb9\u3092\u518d\u78ba\u8a8d\u3057\u3001\u305c\u3072\u81ea\u5206\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u751f\u304b\u3057\u5b66\u7fd2\u3092\u9032\u3081\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u3053\u3093\u306b\u3061\u306f\uff01Web\u30b3\u30fc\u30c0\u30fc\u30fb\u30d7\u30ed\u30b0\u30e9\u30de\u30fc\u306e\u8c9d\u539f\uff08@touhicomu\uff09\u3067\u3059\u3002 Ruby\u3067\u306f\u7e70\u308a\u8fd4\u3057\u3092\u884c\u3046\u51e6\u7406\u304c\u3044\u304f\u3064\u304b\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u304c\u3001 inject\u306f\u30d6\u30ed\u30c3\u30af\u3092\u4f7f\u7528\u3057\u3066\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3092\u884c\u3044\u307e\u3059\u3002 \u4eca\u65e5\u306f\u3001Ruby\u306ein […]<\/p>\n","protected":false},"author":4,"featured_media":38247,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"swell_btn_cv_data":"","footnotes":""},"categories":[2352],"tags":[872,114],"class_list":["post-19219","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ruby-study","tag-inject","tag-ruby"],"acf":[],"yoast_head":"\n\u3010Ruby\u5165\u9580\u3011inject\u306e\u4f7f\u3044\u65b9\u3092\u308f\u304b\u308a\u3084\u3059\u304f\u307e\u3068\u3081\u3066\u307f\u305f\uff01 | \u4f8d\u30a8\u30f3\u30b8\u30cb\u30a2\u30d6\u30ed\u30b0<\/title>\n<meta name=\"description\" content=\"\u3053\u306e\u8a18\u4e8b\u3067\u306f\u300c \u3010Ruby\u5165\u9580\u3011inject\u306e\u4f7f\u3044\u65b9\u3092\u308f\u304b\u308a\u3084\u3059\u304f\u307e\u3068\u3081\u3066\u307f\u305f\uff01 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