In JavaScript, there are various methods available to check if a variable is undefined. Each method has its own use cases and subtle differences. 1. Using typeof Operator The typeof operator can be used to check if a variable is undefined by comparing its type with the string ‘undefined...
How to Check if Object is Empty in JavaScriptHere's a Code Recipe to check if an object is empty or not. For newer browsers, you can use plain vanilla JS and use the new "Object.keys" 🍦 But for older browser support, you can install the Lodash library and use their "isEmpty" ...
In this guide, we will explore many JavaScript methods on how to check if an object is empty. We'll be using Vanilla JavaScript, as well as common libraries such aslodashandunderscore. When it comes to small applications that don't require external dependencies - checking whether an object i...
function isEmpty(obj) { for(var prop in obj) { if(obj.hasOwnProperty(prop)) return false; } return true; } In the above code, we will loop through object properties and if an object has at least one property, then it will enter the loop and return false. If the object doesn’t...
To check if a JavaScript array is empty or not, you can make either of the following checks (depending on your use case): const empty = !Array.isArray(array) || !array.length; const notEmpty = Array.isArray(array) && !!array.length; This works in the following way: In the ...
Javascript check if string is empty 1 <script> 2 const string = ' '; 3 4 function isEmpty(str) { 5 return !str || str.trim().length === 0; 6 } 7 8 function checkString() { 9 var result = isEmpty(string); 10 if (result) { 11 document.getElementById("output")...
In your day-to-day JavaScript development, you might need to check if an object is empty or not. And if you’ve had to do this, you probably know that there’s no single direct solution. However, there are different techniques that you can use to create a custom solution for your own...
for(var property in obj){ if(obj.hasOwnProperty(property)){ //Property exists, object is not empty, //so return FALSE. return false; } } //No properties were found, so return TRUE return true; } The JavaScript function above takes in an object as a parameter before checking to see ...
Read this tutorial and find methods of checking whether a JavaScript object is empty or not. Choose the best one for you and get the code immediately.
For JavaScript objects, there is no built-in .length or .isEmpty method available to check if they are empty. Here are 4 different methods that you can use to make sure that a given object does not have its own properties: Object.entries() Method The Object.entries() method takes an ...