How to Get the Length of a JavaScript Object
Topic: JavaScript / jQueryPrev|Next
Answer: Use the Object.keys() Method
You can simply use the Object.keys() method along with the length property to get the length of a JavaScript object. The Object.keys() method returns an array of a given object's own enumerable property names, and the length property returns the number of elements in that array.
Let's take a look at an example to understand how it basically works:
Example
Try this code »// Sample object
var myObj = {
make: "Ferrari",
model: "Portofino",
fuel: "Petrol",
year: 2018
};
// Getting object length
var size = Object.keys(myObj).length;
console.log(size); // Prints: 4Tip: Enumerable properties are those properties that will show up if you iterate over the object using for..in loop or Object.keys() method. All the properties created via simple assignment or via a property initializer are enumerable by default.
Here's another example demonstrating how get the length of any object in JavaScript.
Example
Try this code »// Creating an object
var myObj = new Object();
// Adding properties
myObj["name"] = "Peter";
myObj["age"] = 24;
myObj["gender"] = "Male";
// Printing object in console
console.log(myObj);
// Prints: {name: "Peter", age: 24, gender: "Male"}
// Getting object length
var size = Object.keys(myObj).length;
console.log(size); // Prints: 3Related FAQ
Here are some more FAQ related to this topic:
- How to test for an empty object in JavaScript
- How to loop through a JavaScript object
- How to merge the properties of two JavaScript objects
