To delete a property of an object, delete key word should be used. Delete key word can be used with both the methods such as Dot method and Bracket method.
syntax
delete object.property;
Example
In the following example initially when the property "country" is executed its value "England" is displayed in the output. But when that property is deleted using delete keyword,instead of "England", undefined is displayed as shown in the output.
<html>
<body>
<script>
var txt = "";
var person = {
"name":"Ram",
"age":27,
"address": {
"houseno" : 123,
"streetname" : "Baker street",
"country": "England"
}
}
document.write("Before deletion :" + " "+ person.address.country);
delete person.address.country;
document.write("</br>");
document.write("After deletion :" + " "+ person.address.country);
</script>
</body>
</html>Output
Before deletion : England After deletion : undefined