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
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...
constarray=['🍝','🍜','🍲'];constnotArray='not array';_.isArray(array);// true_.isArray(notArray);// false Yes, the syntax is the same as Lodash 🤓 #Why can't we usetypeof? Often, we want to check the type of a value, we simply usetypeof ...
To clear an array in JavaScript, you can assign a new empty array "[]" to it or set the length of the array to zero (array.length = 0). The first way is the fastest, and it's handy if you don't have references to the original array anywhere else because it creates a whole ne...
Learn how to populate an empty array in JavaScript. Given an empty array, write JavaScript code to populate an empty array.
The Object.keys() method is the best way to check if an object is empty because it is supported by almost all browsers, including IE9+. It returns an array of a given object's own property names. So we can simply check the length of the array afterward: Object.keys({}).length ==...
log(isEmptyObject(bar)); // output: false As you can see, the Object.entries() method converts an object into an array, and we can count the length of that array to check if the object in question is empty. This is very similar to the Object.keys() method and will give the ...
functiongoodEmptyCheck(value){Object.keys(value).length===0&&value.constructor===Object;// 👈 constructor check}goodEmptyCheck(newString());// false ✅goodEmptyCheck(newNumber());// false ✅goodEmptyCheck(newBoolean());// false ✅goodEmptyCheck(newArray());// false ✅goodEmptyChec...
On this page, we represented to you the three principal ways that allow programmers to detect whether a given array is empty or not. Just see the examples.
Topic: JavaScript / jQueryPrev|NextAnswer: Use the indexOf() MethodYou can use the indexOf() method to check whether a given value or element exists in an array or not. The indexOf() method returns the index of the element inside the array if it is found, and returns -1 if ...