JavaScript: Find the length of an object

JavaScript Object: Exercise-3 with Solution

Object Length

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

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

Sample Solution:

JavaScript Code:

//Write a JavaScript program to get the length of a JavaScript object.

Object.objsize = function(Myobj) {
    var osize = 0, key;
    for (key in Myobj) {
        if (Myobj.hasOwnProperty(key)) osize++;
    }
    return osize;
};

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

var objsize = Object.objsize(student);
console.log('Size of the current object : '+objsize);

Output:

Size of the current object : 3

Flowchart:

Live Demo:

See the Pen javascript-object-exercise-3 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript function that returns the count of an object's own properties using Object.keys().length.
• Write a JavaScript function that computes the total number of properties including inherited ones using a for...in loop.
• Write a JavaScript function that compares two objects based on the number of their properties.
• Write a JavaScript function that dynamically updates and displays the property count of an object after adding or removing properties.

Improve this sample solution and post your code through Disqus.

Previous: Write a JavaScript program to delete the rollno property from the following object. Also print the object before or after deleting the property.
Next: Write a JavaScript program to display the reading status (i.e. display book name, author name and reading status) of the following books.