Counting the Number of Keys using Object.entries

Counting the Number of Keys using Object.getOwnPropertyNames

Counting the Number of Keys using JSON.stringify

JavaScript Object.entries() method is used to return an array consisting of enumerable property [key, value] pairs of the object which are passed as the parameter.

Syntax:

Object.entries(obj);

Example: Count the Number of keys using Object.entries() method. Here, we are using the above-explained approach.

Javascript

const obj = {
    name: 'Aman',
    age: 30,
    city: 'Noida'
};
 
const count = Object.entries(obj).length;
console.log("Number of keys :" + count);

Output

Number of keys :3

Explanation:

The code initializes an object `obj` with properties. It converts the object into an array of key-value pairs using `Object.entries()`, retrieves the length of this array, representing the count of keys, and logs it to the console.

JavaScript Program to Count the Number of Keys/Properties in an Object

An object consists of key-value pairs where each key is a unique identifier associated with a corresponding value.

Several methods can be used to count the number of keys/properties in an object, which are listed below:

Table of Content

Counting the Number of Keys using Object.keys
Counting the Number of Keys using for-in loop
Counting the Number of Keys using Object.getOwnPropertyNames
Counting the Number of Keys using Object.entries
Counting the Number of Keys using JSON.stringify

Tags:

#JavaScript-DSA #JavaScript-Program #DSA #JavaScript #Web Technologies