Delete operator in JavaScript

The JavaScript delete operator removes a property from an object also removes an element from an array.

Delete Property

The JavaScript delete operator removes a property from an object; if no more references to the same property are held, it is eventually released automatically.
var Student = { firstname: "John", lastname: "Doe" } document.write(Student.firstname); delete Student.firstname; document.write(Student.firstname);
output
John undefined

Remove elmnts from Array

var ar = new Array (0, 1, 2, 3, 4,5); document.write (ar + "<br>"); delete ar[1]; document.write (ar);
output
0,1,2,3,4,5 0,,2,3,4,5





Related Topics
  1. JavaScript Interview Questions (Part2)
  2. JavaScript Interview Questions (Part3)
  3. Is JavaScript a true OOP language?
  4. Advantages and Disadvantages of JavaScript
  5. Difference Between JavaScript and ECMAScript?
  6. What is noscript tag?
  7. Escaping Special Characters in JavaScript
  8. What is undefined x 1 in JavaScript?
  9. JavaScript : Logical Operators
  10. Difference between '=', '==' and '===' operators?
  11. How to reload a page using JavaScript?
  12. How to write html code dynamically using JavaScript?
  13. How to add html elements dynamically with JavaScript?
  14. How to load another html page from javascript?
  15. What Is The Disadvantages Using InnerHTML In JavaScript?
  16. What is Browser Object Model
  17. How to detect the OS on the client machine in JavaScript?
  18. Difference between window, document, and screen in Javascript?
  19. Difference between the substr() and substring() in JavaScript?
  20. How to replace all occurrences of a string in JavaScript?
  21. How to test a string as a literal and as an object ?
  22. What is Associative Array? How do we use it?
  23. What is an anonymous function in JavaScript?
  24. What is the use of 'bind' method in JavaScript?
  25. Pure functions Vs. Impure functions in javascript
  26. Is Javascript a Functional Programming Language?
  27. What's the Difference Between Class and Prototypal Inheritance?
  28. Javascript, Pass by Value or Pass by Reference?
  29. How to prevent modification of an object in Javascript?
  30. What is 'this' keyword in JavaScript?
  31. How Does Function Hoisting Work in JavaScript?
  32. What do mean by NULL in Javascript?
  33. What is the Infinity property used for in Javascript?
  34. Event bubbling and Event Capturing in JavScript?
  35. What is "strict mode" and how is it used in JavaScript?
  36. What is the difference between .call() and .apply()?
  37. Entire content of a JavaScript source file in a function block?
  38. What is an immediately-invoked function expression?
  39. What is escape & unescape String functions in JavaScript?
  40. What is the instanceof operator in JavaScript?
  41. What Are RESTful (REpresentational State Transfer)Web Services?
  42. What is Unobtrusive JavaScript & Why it's Important?
  43. What Does JavaScript Void(0) Mean?
  44. What are JavaScript Cookies?
  45. Difference between Client side JavaScript and Server side JavaScript
  46. TypeError: document.getelementbyid(...) is null
  47. Uncaught TypeError: Cannot read property of undefined In JavaScript
  48. What's the difference between Null and Undefined?