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Object Exercises

1. Write a JavaScript program to list the properties of a JavaScript object.

Sample object :

var student = {
name : "David Rayy",
sclass : "VI",
rollno : 12 };

Sample Output : name,sclass,rollno

2. 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 };

3. Write a JavaScript program to get the length of an JavaScript object.

Sample object :

var student = {
name : "David Rayy",
sclass : "VI",
rollno : 12 };

4. Write a JavaScript program to display the reading status (i.e. display book name, author name and reading status) of the following books.

var library = [
   {
       author: 'Bill Gates',
       title: 'The Road Ahead',
       readingStatus: true
   },
   {
       author: 'Steve Jobs',
       title: 'Walter Isaacson',
       readingStatus: true
   },
   {
       author: 'Suzanne Collins',
       title:  'Mockingjay: The Final Book of The Hunger Games',
       readingStatus: false
   }];

5. Write a JavaScript program to get the volume of a Cylinder with four decimal places using object classes.

Volume of a cylinder : V = πr2h
where r is the radius and h is the height of the cylinder.

6. Write a Bubble Sort algorithm in JavaScript.

Note : Bubble sort is a simple sorting algorithm that works by repeatedly stepping through the list to be sorted, Sample Data : [6,4,0, 3,-2,1]
Expected Output : [-2, 0, 1, 3, 4, 6]

7. Write a JavaScript program which returns a subset of a string.

Sample Data : dog
Expected Output : ["d", "do", "dog", "o", "og", "g"]

8. Write a JavaScript program to create a Clock.

Note : The output will come every second.

Expected Console Output :
"14:37:42"
"14:37:43"
"14:37:44"
"14:37:45"
"14:37:46"
"14:37:47"

9. Write a JavaScript program to calculate the area and perimeter of a circle.

Note : Create two methods to calculate the area and perimeter. The radius of the circle will be supplied by the user.

10. Write a JavaScript program to sort an array of JavaScript objects.

Sample Object :

var library = [
   {
       title:  'The Road Ahead',
       author: 'Bill Gates',
       libraryID: 1254
   },
   {
       title: 'Walter Isaacson',
       author: 'Steve Jobs',
       libraryID: 4264
   },
   {
       title: 'Mockingjay: The Final Book of The Hunger Games',
       author: 'Suzanne Collins',
       libraryID: 3245
   }];

Expected Output :

[[object Object] {
  author: "Walter Isaacson",
  libraryID: 4264,
  title: "Steve Jobs"
}, [object Object] {
  author: "Suzanne Collins",
  libraryID: 3245,
  title: "Mockingjay: The Final Book of The Hunger Games"
}, [object Object] {
  author: "The Road Ahead",
  libraryID: 1254,
  title: "Bill Gates"
}]

11. Write a JavaScript function to print all the methods in an JavaScript object.

Test Data :
console.log(all_properties(Array));
["length", "name", "arguments", "caller", "prototype", "isArray", "observe", "unobserve"]

12. Write a JavaScript function to parse an URL.

13. Write a JavaScript function to retrieve all the names of object's own and inherited properties.

14. Write a JavaScript function to retrieve all the values of an object's properties.

15. Write a JavaScript function to convert an object into a list of [key, value] pairs.

16. Write a JavaScript function to get a copy of the object where the keys have become the values and the values the keys.

17. Write a JavaScript function to check if an object contains given property.

18. Write a JavaScript function to check whether a given value is a DOM element.

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