How to get the Length of a JavaScript Object?

We will study how to find the length of an object in JavaScript in this article. Before that, let us first understand the JavaScript object.

What is the JavaScript object?

The object is a container that contains properties and methods. The objects in real life are things such as bags, animals, etc.

If we take an example from real life, then here is an ac object:

Object properties

An ac object has properties such as name, type, color and price. The following are the properties:

ac.name = blue star,

ac.type = split ac,

ac.color = white,

ac.price = 45000

Object methods

A real life ac has methods such as start, lowtemp, swing, and stop. Following are the methods:

ac.start(),

ac.lowtemp(),

ac.swing(),

ac.stop()

We can get the length of a JavaScript object utilizing the following methods:

• Utilizing Object.entries() Method
• Utilizing the Object.keys() Method
• Utilizing Object.objsize() Method
• Utilizing Object.values() Method
• Utilizing for-in loop
• Utilizing the Object.getOwnPropertyNames() Method
• Utilizing the Object.getOwnPropertyNames() Method
• Utilizing for-in loop with hasOwnProperty() Method
• Utilizing the for…of loop with Object.values() Method
• Utilizing Lodash _.size() Method

We will comprehend each method with the help of examples.

Utilizing Object.entries() Method

This method is utilized to return an array of key-value pairs present in the JS object. The key-value pairs are given as parameters to the object then the Object.entries() method will calculate the number of properties contained in the object.

Syntax:

Code:

Output:

 4 

Utilizing the Object.keys() method

This method is utilized for return the no. of properties available in the object then the Object.keys() method is utilized to give the length of the JavaScript object.

Syntax:

Code:

Output:

 4 

Utilizing Object.objsize() Method

The Object.objsize() method is utilized to find the length of the object. We will pass the object into the Object.objsize() method and call the length property to obtain the length of the object.

Syntax:

Code:

Output:

 5 

Utilizing Object.values() Method

This method is utilized to find the length of the object. We will pass the object into the Object.values() method and call the length property to obtain the length.

Syntax:

Code:

Output:

 5 

Utilizing for-in loop

The for-in loop is utilized which iterates through an object properties and give the length of the JavaScript object.

Syntax:

Code:

Output:

 4 

Utilizing the Object.getOwnPropertyNames() Method

The Object.getOwnPropertyNames() method is utilized to return the no. of properties available in the object.

Syntax:

Code:

Output:

 3 

Utilizing for-in loop and hasOwnProperty() Method

The hasOwnProperty() method is utilized to check whether each key is available in the object or not. The for-in loop is looped through each key to give the length of the object.

Syntax:

Code:

Output:

 4 

Utilizing the for...of loop with Object.values() Method

The Object.values() method is utilized to return the list of properties present in the object. The for-of loop is looped through each value of an object to give the length of the object.

Syntax:

Code:

Output:

 5 

Utilizing Lodash _.size() Method

This method is utilized to find the size of the given object. First of all, the object is passed to _.size() and then it returns the no. of properties available in the JavaScript object.

Code:

Output:

 4 

Conclusion:

We have understood how to get the length of a JavaScript object in this article. We have learned many methods with the help of examples.