w3resource

JavaScript: Delete a property from an object and print before or after deleting

JavaScript Object: Exercise-2 with Solution

Write a JavaScript program to delete the rollno property from the following object. Also print the object before or after deleting the property.
Sample object:
var student = {
name : "David Rayy",
sclass : "VI",
rollno : 12 };

Sample Solution:-

HTML Code:

<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Delete a property from an object</title>
</head>
<body>
</body>
</html>

JavaScript Code:

var student =  { 
  name : "David Rayy", 
  sclass : "VI", 
  rollno : 12  };
console.log(student);
delete student.rollno;
console.log(student);

Sample Output:

{"name":"David Rayy","sclass":"VI","rollno":12}
{"name":"David Rayy","sclass":"VI"}

Flowchart:

Flowchart: JavaScript - Delete a property from an object and print before or after deleting.

Live Demo:

See the Pen javascript-object-exercise-2 by w3resource (@w3resource) on CodePen.


Improve this sample solution and post your code through Disqus

Previous: Write a JavaScript program to list the properties of a JavaScript object.
Next: Write a JavaScript program to get the length of an JavaScript object.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.



Follow us on Facebook and Twitter for latest update.

JavaScript: Tips of the Day

Creates a function that accepts up to n arguments, ignoring any additional arguments

Example:

const ary = (fn, n) => (...args) => fn(...args.slice(0, n));
const tips_firstTwoMax = ary(Math.max, 2);
console.log([[3, 5, 'p'], [4, 8, 12], [15]].map(x => tips_firstTwoMax(...x)));

Output:

[5,8,15]

 

We are closing our Disqus commenting system for some maintenanace issues. You may write to us at reach[at]yahoo[dot]com or visit us at Facebook