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...
The JavaScript function above takes in an object as a parameter before checking to see whether it is empty or not. If the object is empty, this function will return a boolean TRUE value. If the object isnot empty, then it will return a FALSE value. Basically, this function loops through...
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...
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...
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.
Object.keys() Method 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...
goodEmptyCheck(new Function()); // false ✅ goodEmptyCheck(new Date()); // false ✅ Nice,干的漂亮 👍 对其他值进行空检查 接着,我们用一些值上测试我们的方法,看看我们会得到了什么 🧪 function isEmptyObject(value) { return Object.keys(value).length === 0 && value.constructor === ...
badEmptyCheck(newFunction());//true?badEmptyCheck(newDate());//true?奇怪的事情发生了 少了constructor判断以后，都为真 使用constructor检测来避免其他构造函数的创建的空对象functiongoodEmptyCheck(value){Object.keys(value).length===0&&value.constructor===Object;//?constructorcheck}goodEmpty...
log("The object is empty"); } else { console.log("The object is not empty"); } Lastly, Another way to check if an object is empty or not is to check the length of the object using Object.entries(obj).length === 0, which returns the number of key-value pairs in the object. ...
“Empty class.” : “空的class”, “Expected a number and instead saw ‘{a}’.”:“应该用数字代替’{a}’”, “‘{a}’ should not be greater than ‘{b}’.”:“‘{a}’不应该比’{b}’大”, “‘hasOwnProperty’ is a really bad name.”: “‘hasOwnProperty’是关键字”, ...