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JavaScript algorithms to practice - Objects

  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 a 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 }]; Sample output: Already read 'The Road Ahead' by Bill Gates. Already read 'Walter Isaacson' by Steve Jobs. You still need to read 'Mockingjay: The Final Book of The Hunger Games' by Suzanne Collins.

  1. 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.

  2. Write a JavaScript program which returns a subset of a string. Sample Data: dog Expected Output: ["d", "do", "dog", "o", "og", "g"]

  3. 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"

  4. 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.

  5. 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" }]

  1. 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"]

  2. Write a JavaScript function to parse an URL.

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

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

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

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

  7. Write a JavaScript function to check whether an object contains given property.

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

Other questions:

A. Write a JavaScript function to double all values in an object made of items and their price. Sample object: prices: { banana: 1, orange: 2, meat: 4, } Expected output: prices: { banana: 2, orange: 4, meat: 8, }