javascript-programes/delete.html at master · VinayManyam/javascript-programes · GitHub

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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script>
//delete operator
//the delete opperator is used to remove any prorperty of an objectit returns undefined type if the programe is trying to accesskey
//the deleted property.u cant delelte property of built in object like map ,date,stringetc
var f={name:'name',id:20,price:2000};
delete f.id;
document.write(f.name+"<br>"+f.id+"<br>"+f.price);
if(f.id==undefined)
{
document.write("<br>id is removed");
alert("hi here i am");
}

//in: it is used to check for any property for an object and returns to if the property found
var p=["tv","mobile","nick"];
var q={id:1,name:'tv',price:2000,dat:new Date("10 june 2017")};
var res=0 in p;
var test="dat" in q;
document.write("<br><font color=\"green\">IN function<br></font>chking 0 index status :"+res);
document.write("<br>date :"+test);


//using anchor as activity
//term void refferes to define any element without a return type
function call(){
document.write("this msg is called by acnhor");
}


</script>
</head>
<body>
<br>
<a href="javascript:call();">call javascript function</a><br	>
<a href="javascript:void();">void javascript function</a><br>
</body>
</html>