{"id":410,"date":"2007-08-30T00:09:08","date_gmt":"2007-08-29T15:09:08","guid":{"rendered":"http:\/\/ecpplus.net\/weblog\/?p=410"},"modified":"2020-06-26T01:57:47","modified_gmt":"2020-06-25T16:57:47","slug":"ruby%e3%81%ae%e9%85%8d%e5%88%97%e6%89%b1%e3%81%86%e3%81%a8%e3%81%8d%e3%81%aetips","status":"publish","type":"post","link":"https:\/\/ecpplus.net\/weblog\/ruby%e3%81%ae%e9%85%8d%e5%88%97%e6%89%b1%e3%81%86%e3%81%a8%e3%81%8d%e3%81%aetips\/","title":{"rendered":"Ruby\u306e\u914d\u5217\u6271\u3046\u3068\u304d\u306etips"},"content":{"rendered":"

Ruby\u3082\u3057\u304f\u306fRails\u3067\u914d\u5217\u3092\u6271\u3046\u6642\u306etips<\/p>\n

Ruby\u306e\u30e1\u30bd\u30c3\u30c9<\/h3>\n

each_with_index<\/h4>\n

each\u3068\u540c\u3058\u611f\u3058\u306a\u3093\u3060\u3051\u3069\u3001\u4f55\u756a\u76ee\u304b\u3063\u3066\u3044\u3046\u6570\u5b57\u3092\u4e00\u7dd2\u306b\u53d6\u308c\u308b\u3002\u30eb\u30fc\u30d7\u306e\u5916\u3067 i = 0<\/code> \u3068\u5b9a\u7fa9\u3057\u3066\u3001\u30eb\u30fc\u30d7\u306e\u4e2d\u3067 i += 1<\/code> \u3068\u304b\u3084\u3089\u306a\u304f\u3066\u304ak\u3002\u30d6\u30ed\u30c3\u30af\u306e\u7b2c\u4e00\u5f15\u6570\u304c\u914d\u5217\u306e\u8981\u7d20\u3067\u3001\u7b2c\u4e8c\u5f15\u6570\u304c\u914d\u5217\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3067\u3059\u3002<\/p>\n

%w(a b c d).each_with_index do |value, index|\n  p value\n  p index\nend<\/pre>\n
\u5b9f\u884c\u7d50\u679c<\/p>\n
\"a\"\n0\n\"b\"\n1\n\"c\"\n2\n\"d\"\n3<\/pre>\n
all?<\/h4>\n
\u30d6\u30ed\u30c3\u30af\u3092\u3068\u3063\u3066\u3001\u5404\u8981\u7d20\u306b\u5bfe\u3057\u3066\u6761\u4ef6\u3092\u6307\u5b9a\u3057\u3066\u3001\u5168\u3066\u304c true \u3060\u3063\u305f\u3089 true \u3092\u8fd4\u3059\u3002<\/p>\n
[1,2,3,4].all? do |value|\n  value > 0\nend<\/pre>\n
\u5b9f\u884c\u7d50\u679c<\/p>\n
true<\/pre>\n
any?<\/h4>\n
\u30d6\u30ed\u30c3\u30af\u3092\u3068\u3063\u3066\u3001\u5404\u8981\u7d20\u306b\u5bfe\u3057\u3066\u6761\u4ef6\u3092\u6307\u5b9a\u3057\u3066\u30011\u3064\u3067\u3082 true \u3060\u3063\u305f\u3089 true \u3092\u8fd4\u3059\u3002<\/p>\n
[1,2,3,4].any? do |value|\n  value == 3\nend<\/pre>\n
\u5b9f\u884c\u7d50\u679c<\/p>\n
true<\/pre>\n
–<\/h4>\n
\u914d\u5217\u304b\u3089\u3001\u7279\u5b9a\u306e\u7269\u3092\u53d6\u308a\u9664\u304f\u6642\u306b\u7c21\u5358\u306b\u4f7f\u3048\u308b\u3002\u4f8b\u3048\u3070\u3001\u914d\u5217\u3092join\u3057\u305f\u3044\u3051\u3069\u3001nil\u306f\u9664\u3044\u3066\u304b\u3089join\u3057\u305f\u3044\u6642\u3068\u304b\u3002<\/p>\n
irb(main):021:0> [1,2,nil,4,5,nil] - [nil]\n=> [1, 2, 4, 5]<\/pre>\n
compact<\/h4>\n
\u914d\u5217\u304b\u3089\u3001nil\u3092\u53d6\u308a\u9664\u3044\u305f\u914d\u5217\u3092\u8fd4\u3059\u3002\u7834\u58ca\u7684\u30e1\u30bd\u30c3\u30c9\u306f compact!<\/p>\n
irb(main):021:0> [1,2,nil,4,5,nil].compact\n=> [1, 2, 4, 5]<\/pre>\n
uniq<\/h4>\n
\u914d\u5217\u304b\u3089\u91cd\u8907\u3057\u305f\u3082\u306e\u3092\u53d6\u308a\u9664\u304d\u305f\u3044\u6642\u3002\u7834\u58ca\u7684\u30e1\u30bd\u30c3\u30c9\u306f uniq!<\/p>\n
irb(main):022:0> [1,1,2,3,4,2,5].uniq\n=> [1, 2, 3, 4, 5]<\/pre>\n
collect (map)<\/h4>\n
\u914d\u5217\u306e\u5404\u8981\u7d20\u3092\u30d6\u30ed\u30c3\u30af\u306b\u6e21\u3057\u3001\u5404\u7d50\u679c\u3092\u914d\u5217\u306b\u3057\u3066\u8fd4\u3057\u307e\u3059\u3002\u7834\u58ca\u7684\u30e1\u30bd\u30c3\u30c9\u306f collect! \u3002map \u3068 collect \u306f\u540c\u3058\u3002<\/p>\n
irb(main):001:0> [1,2,3,4,5].collect do |i|\nirb(main):002:1*   i * 10\nirb(main):003:1> end\n=> [10, 20, 30, 40, 50]<\/pre>\n
index<\/h4>\n
\u5f15\u6570\u306e\u5024\u3068\u4e00\u81f4\u3059\u308b\u6700\u521d<\/strong>\u306e\u4f4d\u7f6e\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n
irb(main):004:0> %w(a b c d e).index('c')\n=> 2<\/pre>\n
Rails\u306e\u30e1\u30bd\u30c3\u30c9<\/h3>\n
in_groups_of<\/h4>\n
\u5f15\u6570\u306b\u500b\u6570\u3092\u53d6\u3063\u3066\u3001\u305d\u306e\u500b\u6570\u3054\u3068\u306e\u914d\u5217\u3092\u751f\u6210\u3057\u3066\u3001\u305d\u306e\u914d\u5217\u3092\u8fd4\u3057\u3066\u304f\u308c\u308b\u3002\u534a\u7aef\u306a\u90e8\u5206\u306fnil\u3067\u57cb\u3081\u3066\u304f\u308c\u308b\u3002table\u7d44\u3080\u3068\u304d\u3068\u304b\u8d85\u4fbf\u5229\u3002\u65e5\u672c\u8a9e\u3080\u305a\u3044\u3002<\/p>\n
 [1,2,3,4,5,6,7].in_groups_of(3) do |group|\n?> p group\n>> end\n[1, 2, 3]\n[4, 5, 6]\n[7, nil, nil]\n=> nil<\/pre>\n
\u307e\u305f\u4eca\u5ea6\u8ffd\u8a18\u3059\u308b\u308f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
Ruby\u3082\u3057\u304f\u306fRails\u3067\u914d\u5217\u3092\u6271\u3046\u6642\u306etips Ruby\u306e\u30e1\u30bd\u30c3\u30c9 each_with_index each\u3068\u540c\u3058\u611f\u3058\u306a\u3093\u3060\u3051\u3069\u3001\u4f55\u756a\u76ee\u304b\u3063\u3066\u3044\u3046\u6570\u5b57\u3092\u4e00\u7dd2\u306b\u53d6\u308c\u308b\u3002\u30eb\u30fc\u30d7\u306e\u5916\u3067 i = 0 \u3068\u5b9a\u7fa9\u3057\u3066\u3001\u30eb\u30fc\u30d7\u306e\u4e2d\u3067 […]<\/p>\n","protected":false},"author":1,"featured_media":2872,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[43],"tags":[8],"class_list":["post-410","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-development","tag-ruby"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/ecpplus.net\/weblog\/wp-json\/wp\/v2\/posts\/410","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ecpplus.net\/weblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ecpplus.net\/weblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ecpplus.net\/weblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ecpplus.net\/weblog\/wp-json\/wp\/v2\/comments?post=410"}],"version-history":[{"count":2,"href":"https:\/\/ecpplus.net\/weblog\/wp-json\/wp\/v2\/posts\/410\/revisions"}],"predecessor-version":[{"id":2882,"href":"https:\/\/ecpplus.net\/weblog\/wp-json\/wp\/v2\/posts\/410\/revisions\/2882"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ecpplus.net\/weblog\/wp-json\/wp\/v2\/media\/2872"}],"wp:attachment":[{"href":"https:\/\/ecpplus.net\/weblog\/wp-json\/wp\/v2\/media?parent=410"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ecpplus.net\/weblog\/wp-json\/wp\/v2\/categories?post=410"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ecpplus.net\/weblog\/wp-json\/wp\/v2\/tags?post=410"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}