{"id":167,"date":"2022-06-29T10:26:04","date_gmt":"2022-06-29T02:26:04","guid":{"rendered":"http:\/\/yanzhenhua.top\/?p=167"},"modified":"2022-06-29T10:28:23","modified_gmt":"2022-06-29T02:28:23","slug":"ruby%e4%b8%ad%e7%9a%84%e5%b0%8f%e7%9f%a5%e8%af%86%e7%82%b9%e6%80%bb%e7%bb%93","status":"publish","type":"post","link":"http:\/\/yanzhenhua.top\/?p=167","title":{"rendered":"Ruby\u4e2d\u7684\u5c0f\u77e5\u8bc6\u70b9\u603b\u7ed3"},"content":{"rendered":"
    \n
  1. \n
    ruby\u4e2djson \u5b57\u7b26\u4e32\u8f6c\u54c8\u5e0c\u00a0\u00a0<\/span>JSON.parse(data)<\/pre>\n<\/li>\n
  2. \n
    Ruby \u7684\u6570\u503c\u6bd4\u8f83 1 == '1'\u00a0 \u00a0\u8fd4\u56defalse<\/pre>\n<\/li>\n
  3. \n
    str.shop! \u53bb\u9664\u5b57\u7b26\u4e32\u672b\u5c3e\u7684\u5b57\u7b26\u5e76\u8fd4\u56de,\u52a0\uff01\u662f\u6539\u53d8\u4e86\u539f\u6709\u7684\u5b57\u7b26\u4e32\u5c06\u65b0\u7684\u503c\u8fd4\u56de\uff0c\u4e0d\u52a0\u611f\u53f9\u4e0d\u4f1a\u6539\u53d8\u539f\u672c\u7684\u5b57\u7b26\u4e32\u3002<\/pre>\n<\/li>\n
  4. \n
    \u5b57\u7b26\u4e32\u62c6\u5206\u6570\u7ec4\uff1astr.split(“,”)<\/span><\/p>\n<\/li>\n
  5. \n
    \u6570\u7ec4\u53bb\u91cd\uff1aarray.uniq<\/span><\/p>\n<\/li>\n
  6. if 0. if\u00a0[] \u7b49\u90fd\u662f\u53ef\u4ee5\u8fdb\u5165\u5230\u5224\u65ad\u4e2d\u7684\u00a0 if nil \u4e0d\u4f1a<\/span><\/li>\n
  7. \u77e5\u8bc6\u70b9\uff1a\u00a0\u00a0\u2018a’ + nil + ‘c\u2019 \u4f1a\u62a5\u9519\uff01 \u89e3\u51b3\u529e\u6cd5\uff1a ‘a’ + nil.to_s + ‘b’<\/strong><\/li>\n
  8. \n
    .nil? , .empty? .blank? .present?\u533a\u522b\uff1a<\/strong><\/span><\/p>\n
    .nil? \u5224\u65ad\u5bf9\u8c61\u662f\u5426\u5b58\u5728\uff08nil\uff09\u3002\u4e0d\u5b58\u5728\u7684\u5bf9\u8c61\u90fd\u662fnil\u7684\u3002<\/strong><\/p>\n
    nil.nil? =>true<\/span><\/p>\n
    false.nil? =>false<\/span><\/p>\n
    1.nil? =>false<\/span><\/p>\n
    0.nil? =>false<\/span><\/p>\n
    “”.nil? =>false<\/span><\/p>\n
    [ ].nil? =>false<\/span><\/p>\n
    { }.nil? =>false<\/span><\/p>\n
    .empty? \u524d\u63d0\u662f\u5bf9\u8c61\u5df2\u5b58\u5728\uff0c\u5224\u65ad\u662f\u5426\u4e3a\u7a7a\u5b57\u6bb5\uff0c\u6bd4\u5982\u7a7a\u5b57\u7b26\u4e32\uff0c\u7a7a\u6570\u7ec4\uff0c\u7a7a\u5bf9\u8c61\u3002<\/strong><\/p>\n
    “”.empty? =>true<\/span><\/p>\n
    ” “.empty? =>false \u6ce8\u610f\u6709\u7a7a\u683c<\/span><\/p>\n
    “abc”.empty? =>false<\/span><\/p>\n
    [ ].empty? =>true<\/span><\/p>\n
    [ nil ].empty? =>false<\/span><\/p>\n
    [1,2,3].empty? =>false<\/span><\/p>\n
    1.empty? => NoMethodError: undefined method `empty?’<\/span><\/p>\n
    {}.empty? =>true<\/span><\/p>\n
    .blank?\u7b49\u4e8e\u540c\u65f6\u6ee1\u8db3 .nil? \u548c .empty? \u3002\u5982\u679c\u5bf9\u8c61\u662ffalse, empty, \u7a7a\u767d\u5b57\u7b26. \u4f8b\uff1a<\/strong><\/p>\n
    “”, ” “, nil , [], \u548c{}\u90fd\u7b97\u662fblank\u3002<\/span><\/p>\n
    object.blank? \u76f8\u5f53\u4e8eobject.nil? || object.empty?<\/span><\/p>\n
    .nil? \u548c .empty? \u662fruby\u7684\u65b9\u6cd5\u3002 .blank?\u548cpresent? \u662frails\u7684\u65b9\u6cd5\uff0c\u9700\u8981\u5728rails\u73af\u5883\u4e0b\u624d\u80fd\u6d4b\u8bd5\uff0crails c\u3002<\/strong><\/p>\n
    true.blank? =>false<\/span><\/p>\n
    false.blank? =>true<\/span><\/p>\n
    “true”.blank? =>false<\/span><\/p>\n
    “”.blank? =>true<\/span><\/p>\n
    ” “.blank? =>true<\/span><\/p>\n
    “\\n”.blank? =>false<\/span><\/p>\n
    ‘\\n’.blank? =>false<\/span><\/p>\n
    {}.blank? =>true<\/span><\/p>\n
    1.blank? =>false<\/span><\/p>\n
    [].blank? =>true<\/span><\/p>\n
    nil.blank? => true<\/span><\/p>\n
    present?\u65b9\u6cd5\u662fblank?\u76f8\u53cd\u7684\u65b9\u6cd5\uff0c\u7528\u4e8e\u5224\u65ad\u662f\u5426\u5b58\u5728\uff0cpresent\uff1f\u4e0e\uff01blank\uff1f\u76f8\u540c\uff0c\u6216\uff08\uff01present\uff1f\u4e0eblank\uff1f\uff09<\/strong><\/p>\n
    nil.present? =>false<\/span><\/p>\n
    [].present? =>false<\/span><\/p>\n
    “hello”.present? =>true<\/span><\/p>\n
    [“a”].present? =>true<\/span><\/p>\n<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"
    ruby\u4e2djson \u5b57\u7b26\u4e32\u8f6c\u54c8\u5e0c\u00a0\u00a0JSON.parse(data) Ruby \u7684\u6570\u503c\u6bd4\u8f83 1 ==… \u7ee7\u7eed\u9605\u8bfb Ruby\u4e2d\u7684\u5c0f\u77e5\u8bc6\u70b9\u603b\u7ed3<\/span><\/i><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":{"0":"post-167","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-ruby","7":"h-entry","9":"h-as-article"},"_links":{"self":[{"href":"http:\/\/yanzhenhua.top\/index.php?rest_route=\/wp\/v2\/posts\/167","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/yanzhenhua.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/yanzhenhua.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/yanzhenhua.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/yanzhenhua.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=167"}],"version-history":[{"count":3,"href":"http:\/\/yanzhenhua.top\/index.php?rest_route=\/wp\/v2\/posts\/167\/revisions"}],"predecessor-version":[{"id":170,"href":"http:\/\/yanzhenhua.top\/index.php?rest_route=\/wp\/v2\/posts\/167\/revisions\/170"}],"wp:attachment":[{"href":"http:\/\/yanzhenhua.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=167"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/yanzhenhua.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=167"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/yanzhenhua.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=167"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}