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;//
1. Use Object.keys Object.keys will return an array, which contains the property names of the object. 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 Objec...
1. isCheck 此代码片段用于检查值是否属于某个数据类型。 const isCheck = (type, val) => ![undefined, null].includes(val) && val.constructor === type; console.log(isCheck(Array, ["a"])); // true console.log(isCheck(Object, {})); // true console.log(isCheck(ArrayBuffer, new Array...
// program to check if an object is an arrayfunctioncheckObject(arr){// check if arr is arrayconstresult =Array.isArray(arr);if(result) {console.log(`[${arr}] is an array.`); }else{console.log(`${arr}is not an array.`); } }constarray = [1,2,3];// call the functionchec...
The length property is used to check the number of keys. If it returns 0 keys, then the object is empty.Javascript empty object1 2 3 4 5 6 7 //javascript empty object let obj = {}; function isEmpty(object) { return Object.keys(object).length === 0; } let emptyObj = isEmpty(...
Here,is()is a static method. Hence, we need to access the method using the class name,Object. is() Parameters Theis()method takes in: value1- the first value to compare. value2- the second value to compare. is() Return Value ...
JavaScript Object Literal An object literal is a list of propertynames:valuesinside curly braces{}. {firstName:"John", lastName:"Doe", age:50, eyeColor:"blue"}; Note: Anobject literalis also called anobject initializer. Creating a JavaScript Object ...
Object structure is: delay: { "show": 500, "hide": 100 } html boolean false Insert HTML into the tooltip. If false, jQuery's text method will be used to insert content into the DOM. Use text if you're worried about XSS attacks. placement string | function 'top' How to position th...
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...
How can you check if a property exists in an object using the hasOwnProperty method in Vue.js? This is a simple Vue.js app that uses two computed properties, hasName() and hasEmail(), to check if the user data object has a name and email property respectively. The app then displays...