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
While writing a program or any script or any piece of frontend code in Javascript, if you want to check if an array is empty or not, you can use the length property of arrays in Javascript. The length property of the array returns the count of the number of elements stored in the ...
If the length of the array is 0, then we know that the object is empty. function isEmpty(obj) { return **Object.keys(obj).length === 0**; } We can also check this using Object.values and Object.entries. This is typically the easiest way to determine if an object is empty. ...
Object.keys()is a static method that returns an Array when we pass an object to it, which contains the property names (keys) belonging to that object. We can check whether thelengthof this array is0or higher - denoting whether any keys are present or not. If no keys are present, the...
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 ==...
console.log(isEmptyObject(bar));// output: false As you can see, theObject.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 theObject.keys()method and will give the same...
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" ...
Checks if value is classified as an Array object. constarray=['🍝','🍜','🍲'];constnotArray='not array';_.isArray(array);// true_.isArray(notArray);// false Underscore Returns true if object is an Array. constarray=['🍝','🍜','🍲'];constnotArray='not array';_.isArr...
},// 输出基于当前配置configuration的一个值myMethod2:function () {console.log("Caching is:" + (this.myConfig.useCaching ) ?"enabled" :"disabled" ); },// 重写当前的配置(configuration)myMethod3:function(newConfig ) {if (typeof newConfig ==="object" ) {this.myConfig = newConfig;consol...
JavaScript offers several ways to check if an array includes a specific value. In this article, we will explore some of the most common methods for checking for the presence of a value in an array. The first method we will look at is the indexOf() method. This method returns the index...