{"id":5959,"date":"2011-07-05T12:28:56","date_gmt":"2011-07-05T04:28:56","guid":{"rendered":"http:\/\/ihower.tw\/blog\/?p=5959"},"modified":"2011-07-06T00:33:04","modified_gmt":"2011-07-05T16:33:04","slug":"%e5%85%a9%e5%80%8b-ruby-%e5%bb%ba%e6%a7%8b-array-%e5%92%8c-hash-%e7%9a%84%e5%b0%8f%e6%8a%80%e5%b7%a7","status":"publish","type":"post","link":"https:\/\/ihower.tw\/blog\/5959-%e5%85%a9%e5%80%8b-ruby-%e5%bb%ba%e6%a7%8b-array-%e5%92%8c-hash-%e7%9a%84%e5%b0%8f%e6%8a%80%e5%b7%a7","title":{"rendered":"\u5169\u500b Ruby \u5efa\u69cb Array \u548c Hash \u7684\u5c0f\u6280\u5de7"},"content":{"rendered":"<h3>Array<\/h3>\n<p>\u6211\u60f3\u4f60\u53ef\u80fd\u5beb\u904e\u4ee5\u4e0b\u9019\u6a23\u7684\u7a0b\u5f0f\u3002\u5176\u4e2d params[:a] \u53ef\u4ee5\u53ea\u6709\u4e00\u500b\u5143\u7d20\uff0c\u4e5f\u53ef\u4ee5\u662f\u9663\u5217\u3002\u4f46\u662f\u70ba\u4e86\u63a5\u4e0b\u4f86\u80fd\u5920\u8655\u7406\uff0c\u6211\u5011\u9700\u8981\u8f49\u6210\u9663\u5217 array \u8b8a\u6578\uff1a<\/p>\n<p><code><br \/>\narray = (params[:a].is_a? Array)? params[:a] : [params[:a]]<br \/>\n<\/code><\/p>\n<p>\u9019\u88e1\u6211\u5011\u624b\u52d5\u5224\u65b7\u4e86 params[:a] \u662f\u4e0d\u662f\u9663\u5217\uff0c\u5be6\u5728\u662f\u6709\u9ede ugly\u3002\u5176\u5be6 Ruby \u5167\u5efa\u7684 API \u5c31\u53ef\u4ee5\u652f\u63f4\u4e0b\u8ff0\u5beb\u6cd5\uff1a<\/p>\n<p><code><br \/>\narray = Array(params[:a])<br \/>\n<\/code><\/p>\n<p>\u7121\u8ad6 params[:a] \u662f\u9663\u5217\u9084\u662f\u55ae\u4e00\u5143\u7d20\uff0c<code>Array(params[:a])<\/code>\u6703\u78ba\u4fdd\u51fa\u4f86\u4e00\u5b9a\u662f\u9663\u5217\u3002<\/p>\n<h3>Hash<\/h3>\n<p>\u4f60\u6709\u4e00\u500b\u7269\u4ef6\u6216\u662f\u9663\u5217\uff0c\u4f60\u60f3\u8981\u8f49\u6210 Hash\uff0c\u6700\u5e38\u898b\u57fa\u672c\u7684\u4f5c\u6cd5\u6703\u662f\u5148\u521d\u59cb\u4e00\u500b hash\uff0c\u7136\u5f8c\u8fed\u4ee3\u8a2d\u5b9a\u5b83\uff1a<\/p>\n<pre>\r\n<code>\r\nhash = {}\r\ndata.each { |d| hash[d.foo] =  d.bar }\r\n<\/code>\r\n<\/pre>\n<p>\u9ad8\u7d1a\u4e00\u9ede\u7684\uff0c\u4e5f\u8a31\u6703\u601d\u8003\u600e\u6a23\u5beb\u6210\u4e00\u884c\uff0c\u7136\u5f8c\u60f3\u5230\u7528 inject\uff1a<\/p>\n<pre>\r\n<code>\r\nhash = data.inject({}) { |h,d| h[d.foo] =  d.bar; h }\r\n<\/code>\r\n<\/pre>\n<p>\u4e0d\u904e\uff0c\u9019\u88e1\u6211\u8981\u4ecb\u7d39\u4e00\u7a2e\u6211\u7684\u6700\u611b\uff1a<\/p>\n<pre>\r\n<code>\r\nhash = Hash[ data.map {|d| [d.foo, d.bar]} ]\r\n<\/code>\r\n<\/pre>\n<p><code>Hash[]<\/code>\u662f\u4e00\u500bRuby\u5167\u5efa\u7684API\u53ef\u4ee5\u628a\u9663\u5217\u8f49\u6210Hash\uff0c\u800c\u4e14\u6548\u80fd\u975e\u5e38\u597d\uff0c\u6bd4\u524d\u5169\u500b\u65b9\u6cd5\u90fd\u597d\u3002<code>inject<\/code>\u60f3\u7576\u7136\u662f\u6700\u6162\u7684\uff0c\u6211\u6700\u4e0d\u63a8\u85a6\u4f7f\u7528\u3002<\/p>\n<p>\u6709\u4eba\u8ddf\u6211\u62b1\u6028<code>Hash[]<\/code>\u6709\u9ede magic \u53ef\u8b80\u6027\u4e0d\u4f73\u3002\u53ef\u662f\u554a\uff0c\u9019\u662f Ruby &#8220;\u539f\u751f&#8221;\u7684 <a href=\"http:\/\/www.ruby-doc.org\/core\/classes\/Hash.html\">Hash API<\/a>\uff0c\u4e00\u9ede\u90fd\u4e0d magic\u3002\u4f60\u4e0d\u77e5\u9053\u770b\u4e0d\u61c2\u8ddf\u62b1\u6028\u7a0b\u5f0f\u78bc\u53ef\u8b80\u6027\u4e0d\u4f73\uff0c\u6211\u500b\u4eba\u8a8d\u70ba\u662f\u5169\u4ef6\u4e8b\u60c5\u54e9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Array \u6211\u60f3\u4f60\u53ef\u80fd\u5beb\u904e\u4ee5\u4e0b\u9019\u6a23\u7684\u7a0b\u5f0f\u3002\u5176\u4e2d params[:a] \u53ef\u4ee5\u53ea\u6709\u4e00\u500b\u5143\u7d20\uff0c\u4e5f\u53ef\u4ee5\u662f\u9663\u5217\u3002\u4f46\u662f\u70ba\u4e86 &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/ihower.tw\/blog\/5959-%e5%85%a9%e5%80%8b-ruby-%e5%bb%ba%e6%a7%8b-array-%e5%92%8c-hash-%e7%9a%84%e5%b0%8f%e6%8a%80%e5%b7%a7\" class=\"more-link\">\u95b1\u8b80\u5168\u6587<span class=\"screen-reader-text\">\u3008\u5169\u500b Ruby \u5efa\u69cb Array \u548c Hash \u7684\u5c0f\u6280\u5de7\u3009<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[31],"tags":[],"class_list":["post-5959","post","type-post","status-publish","format-standard","hentry","category-ruby","entry"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p1q6tG-1y7","jetpack_sharing_enabled":true,"jetpack_likes_enabled":true,"_links":{"self":[{"href":"https:\/\/ihower.tw\/blog\/wp-json\/wp\/v2\/posts\/5959","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ihower.tw\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ihower.tw\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ihower.tw\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ihower.tw\/blog\/wp-json\/wp\/v2\/comments?post=5959"}],"version-history":[{"count":12,"href":"https:\/\/ihower.tw\/blog\/wp-json\/wp\/v2\/posts\/5959\/revisions"}],"predecessor-version":[{"id":5973,"href":"https:\/\/ihower.tw\/blog\/wp-json\/wp\/v2\/posts\/5959\/revisions\/5973"}],"wp:attachment":[{"href":"https:\/\/ihower.tw\/blog\/wp-json\/wp\/v2\/media?parent=5959"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ihower.tw\/blog\/wp-json\/wp\/v2\/categories?post=5959"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ihower.tw\/blog\/wp-json\/wp\/v2\/tags?post=5959"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}