If you don't want it to throw aTypeError, you can add an extra check: letvalue;value// 👈 null and undefined check&&Object.keys(value).length===0&&value.constructor===Object;value=null;// nullvalue=undefined;// undefined Perfect, no error is thrown 😁 ...
JSON.stringify(objectName) === '{}'; We could also easily be wrapped into a function: const isEmptyObject = (objectName) => { return JSON.stringify(objectName) === '{}'; } console.log(isEmptyObject(emptyObject)); // true Check if Object Is Empty With JavaScript Libraries Librari...
Javascript Boolean Type Introduction Using the typeof operator, we can check the datatype of a variable. If the variable is a Boolean value, typeof will return the string 'boolean'. Copy vara =Boolean(true);varb = false;//www.java2s.comvarc ="";vard = newDate();if(typeofa ==='...
Javascript empty object let obj = {name: 'W3Docs'}; function isEmptyObj(obj) { for (let key in obj) { if (obj.hasOwnProperty(key)) { return false; } } } let emptyObj = isEmptyObj(obj); console.log(emptyObj); Run > Reset ...
If the object has the property with the undefined value, typeof is not recommended.Javascript typeof method with undefined1 2 3 4 5 6 7 8 9 10 let myObj = { welcome: "Welcome" }; if ("undefined" === typeof (myObj["welcome"])) { // The property DOESN'T exists c...
How to Check If an Object Is Empty in JavaScript Use Object.keys Loop Over Object Properties With for…in Use JSON.stringify Use jQuery Use Underscore and Lodash Libraries 1. Use Object.keys Object.keys will return an array, which contains the property names of the object. If the length of...
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...
typeof check: if (typeof str === "string") Checks if str is of type "string", which applies to string literals. It does not return "string" for new String() because new String() is an object. Fallback: return "another type"; Handles cases where str is neither a string literal ...
How do you check if an element is hidden in JavaScript?Craig Buckler
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 ...