typeof and instanceof Operator in JavaScript
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Program 1
<html>
<head>
<title>typeof and instance of operator</title>
<script type="text/javascript">
/*
/*
JavaScript Data Type
number
boolean
bigint
string
symbol
null
undefined
*/
document.writeln("<center>")
document.writeln("<h1>")
let a=123
let b=123.23
let c=true
let d=123n
// document.writeln(typeof(a)) // number
// document.writeln("<br>"+typeof(b)) //number
// document.writeln("<br>"+typeof(c)) //boolean
// document.writeln("<br>"+typeof(d)) // biging
// let s="Hello"
// document.writeln("<br>"+typeof(s))
// document.writeln("<br>"+typeof(Symbol()))
// document.writeln("<br>"+typeof(null)) //Object
// document.writeln("<br>"+typeof(undefined)) //undefined
// document.writeln("<br>"+ null==undefined)
//document.writeln("<br>"+typeof(x))
// document.writeln("<br>"+ typeof(10+10)) //number
// document.writeln("<br>"+ typeof(10+"10")) //string
// document.writeln("<br>"+ typeof("10"+"10")) //string
// document.writeln("<br>"+ typeof(10+true)) //number
// document.writeln("<br>"+ typeof(false+10)) //number
// document.writeln("<br>"+ typeof(true+true)) //number
// document.writeln("<br>"+ typeof("10"+true)) //string
// document.writeln("<br>"+ typeof(null+null))//number
// document.writeln("<br>"+ typeof(10-10))//number
// document.writeln("<br>"+ typeof("10"-10))//number
// document.writeln("<br>"+ typeof("10"-"10"))//number
// let myar=[1,2,3,4,5,6,7,8]
// document.writeln("<br>"+ typeof(myar))//number
// let myset=new Set(["Pune","Indore","Delhi"])
// document.writeln("<br>"+ typeof(myset))//number
// let mymap=new Map([[1,"Indore"],[2,"Pune"]])
// document.writeln("<br>"+ typeof(mymap))//number
// function display()
// {}
// document.writeln("<br>"+ typeof(display))//number
// instanceof
const myset=new Set(["Indore","Pune","Bhopal","Delhi","Ujjain",123,true,12.55])
document.writeln(myset instanceof Set)
S= new String("Hello")
document.writeln(S instanceof String)
document.writeln("</h1>")
document.writeln("</center>")
</script>
</head>
<body>
<center>
</center>
</body>
</html>
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