{"id":145018,"date":"2025-05-07T15:02:05","date_gmt":"2025-05-07T09:32:05","guid":{"rendered":"https:\/\/data-flair.training\/blogs\/?p=145018"},"modified":"2025-05-07T15:02:05","modified_gmt":"2025-05-07T09:32:05","slug":"typeof-and-instanceof-operator-in-javascript","status":"publish","type":"post","link":"https:\/\/data-flair.training\/blogs\/typeof-and-instanceof-operator-in-javascript\/","title":{"rendered":"typeof and instanceof Operator in JavaScript"},"content":{"rendered":"<h3>Program 1<\/h3>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">&lt;html&gt;\r\n    &lt;head&gt;\r\n        &lt;title&gt;typeof and instance of operator&lt;\/title&gt;\r\n        &lt;script type=\"text\/javascript\"&gt;\r\n            \/* \r\n              \/* \r\n               JavaScript Data Type\r\n            number\r\n            boolean\r\n            bigint\r\n            string\r\n            symbol\r\n            null\r\n            undefined\r\n           *\/\r\n                \r\n                 document.writeln(\"&lt;center&gt;\")\r\n                    document.writeln(\"&lt;h1&gt;\")   \r\n                    let a=123\r\n                    let b=123.23\r\n                    let c=true\r\n                    let d=123n\r\n                    \/\/ document.writeln(typeof(a))  \/\/ number\r\n                    \/\/ document.writeln(\"&lt;br&gt;\"+typeof(b))  \/\/number\r\n                    \/\/ document.writeln(\"&lt;br&gt;\"+typeof(c)) \/\/boolean\r\n                    \/\/ document.writeln(\"&lt;br&gt;\"+typeof(d)) \/\/ biging\r\n                    \/\/ let s=\"Hello\"\r\n                    \/\/ document.writeln(\"&lt;br&gt;\"+typeof(s)) \r\n                    \/\/ document.writeln(\"&lt;br&gt;\"+typeof(Symbol())) \r\n                    \/\/ document.writeln(\"&lt;br&gt;\"+typeof(null)) \/\/Object\r\n                    \/\/ document.writeln(\"&lt;br&gt;\"+typeof(undefined)) \/\/undefined\r\n                    \/\/ document.writeln(\"&lt;br&gt;\"+ null==undefined)\r\n                    \/\/document.writeln(\"&lt;br&gt;\"+typeof(x))  \r\n                    \/\/ document.writeln(\"&lt;br&gt;\"+ typeof(10+10))  \/\/number\r\n                    \/\/ document.writeln(\"&lt;br&gt;\"+ typeof(10+\"10\"))  \/\/string\r\n                    \/\/ document.writeln(\"&lt;br&gt;\"+ typeof(\"10\"+\"10\")) \/\/string \r\n                    \/\/ document.writeln(\"&lt;br&gt;\"+ typeof(10+true))  \/\/number\r\n                    \/\/ document.writeln(\"&lt;br&gt;\"+ typeof(false+10))  \/\/number\r\n                    \/\/ document.writeln(\"&lt;br&gt;\"+ typeof(true+true))  \/\/number\r\n                    \/\/ document.writeln(\"&lt;br&gt;\"+ typeof(\"10\"+true))  \/\/string\r\n                    \/\/ document.writeln(\"&lt;br&gt;\"+ typeof(null+null))\/\/number\r\n                    \/\/ document.writeln(\"&lt;br&gt;\"+ typeof(10-10))\/\/number \r\n                    \/\/ document.writeln(\"&lt;br&gt;\"+ typeof(\"10\"-10))\/\/number \r\n                    \/\/ document.writeln(\"&lt;br&gt;\"+ typeof(\"10\"-\"10\"))\/\/number\r\n                        \/\/ let myar=[1,2,3,4,5,6,7,8]\r\n                        \/\/ document.writeln(\"&lt;br&gt;\"+ typeof(myar))\/\/number\r\n                        \/\/ let myset=new Set([\"Pune\",\"Indore\",\"Delhi\"])\r\n                        \/\/ document.writeln(\"&lt;br&gt;\"+ typeof(myset))\/\/number\r\n                        \/\/  let mymap=new Map([[1,\"Indore\"],[2,\"Pune\"]])   \r\n                        \/\/  document.writeln(\"&lt;br&gt;\"+ typeof(mymap))\/\/number\r\n                        \/\/ function display()\r\n                        \/\/ {}\r\n                        \/\/ document.writeln(\"&lt;br&gt;\"+ typeof(display))\/\/number\r\n\r\n                        \/\/ instanceof\r\n\r\n                        const myset=new Set([\"Indore\",\"Pune\",\"Bhopal\",\"Delhi\",\"Ujjain\",123,true,12.55])\r\n                         document.writeln(myset instanceof Set)\r\n                         S= new String(\"Hello\")                \r\n                         document.writeln(S instanceof String)             \r\n\r\n\r\n\r\n\r\n                    document.writeln(\"&lt;\/h1&gt;\")\r\n                document.writeln(\"&lt;\/center&gt;\")   \r\n         &lt;\/script&gt;\r\n    &lt;\/head&gt;\r\n    &lt;body&gt;\r\n        &lt;center&gt;\r\n              \r\n         &lt;\/center&gt;   \r\n    \r\n    &lt;\/body&gt;\r\n&lt;\/html&gt;<\/pre>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Program 1 &lt;html&gt; &lt;head&gt; &lt;title&gt;typeof and instance of operator&lt;\/title&gt; &lt;script type=&#8221;text\/javascript&#8221;&gt; \/* \/* JavaScript Data Type number boolean bigint string symbol null undefined *\/ document.writeln(&#8220;&lt;center&gt;&#8221;) document.writeln(&#8220;&lt;h1&gt;&#8221;) let a=123 let b=123.23 let c=true let d=123n&#46;&#46;&#46;<\/p>\n","protected":false},"author":581,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18979],"tags":[7758,34031,31621,31622,34034,34033,34028,34030,34029],"class_list":["post-145018","post","type-post","status-publish","format-standard","hentry","category-javascript","tag-javascript","tag-javascript-instanceof-operator","tag-javascript-practical","tag-javascript-program","tag-javascript-program-on-instanceof-operator","tag-javascript-program-on-typeof-operator","tag-javascript-typeof-and-instanceof-operator","tag-javascript-typeof-operator","tag-typeof-and-instanceof-operator-in-javascript"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>typeof and instanceof Operator in JavaScript - DataFlair<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/data-flair.training\/blogs\/typeof-and-instanceof-operator-in-javascript\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"typeof and instanceof Operator in JavaScript - DataFlair\" \/>\n<meta property=\"og:description\" content=\"Program 1 &lt;html&gt; &lt;head&gt; &lt;title&gt;typeof and instance of operator&lt;\/title&gt; &lt;script type=&quot;text\/javascript&quot;&gt; \/* \/* JavaScript Data Type number boolean bigint string symbol null undefined *\/ document.writeln(&quot;&lt;center&gt;&quot;) document.writeln(&quot;&lt;h1&gt;&quot;) let a=123 let b=123.23 let c=true let d=123n&#046;&#046;&#046;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/data-flair.training\/blogs\/typeof-and-instanceof-operator-in-javascript\/\" \/>\n<meta property=\"og:site_name\" content=\"DataFlair\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/DataFlairWS\/\" \/>\n<meta property=\"article:published_time\" content=\"2025-05-07T09:32:05+00:00\" \/>\n<meta name=\"author\" content=\"DataFlair Team\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@DataFlairWS\" \/>\n<meta name=\"twitter:site\" content=\"@DataFlairWS\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"DataFlair Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"typeof and instanceof Operator in JavaScript - DataFlair","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/data-flair.training\/blogs\/typeof-and-instanceof-operator-in-javascript\/","og_locale":"en_US","og_type":"article","og_title":"typeof and instanceof Operator in JavaScript - DataFlair","og_description":"Program 1 &lt;html&gt; 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