We can use the built-in Object.keys method to check for an empty object.const empty = {}; Object.keys(empty).length === 0 && empty.constructor === Object; # Why do we need an additional constructor check?You may be wondering why do we need the constructor check. Well, it's to...
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 ...
1. TheObject.keys()Method TheObject.keys()method returns an array of enumerable property names of a given object. And thus, we can use it to check if an object has any properties by counting the length of this array. Let’s have a look at the following example. ...
2);// Map(1) {"a" => 1, "b" => 2}map.set(`c`,3);// Map(2) {"a" => 1, "b" => 2, "c" => 3}constautoConvertMapToObject= (map) => {constobj = {};for(constitemof[...map]) {const[
Thewindow.matchMedia()method returns a MediaQueryList object representing the results of the specified CSS media query string. The value of the matchMedia() method can be any of the media features of theCSS @media rule, like min-height, min-width, orientation, etc. ...
Use JSON.stringify() to Convert Array to String in JavaScript The JSON.stringify() method allows you to convert any JavaScript object or a value into a string. This is cleaner, as it quotes strings inside of the array and handles nested arrays properly. This method can take up to three ...
当然,自从asm.js及WebAssembly的全面推进后,我们可以使用其进一步增强我们核心代码的安全性,但由于asm.js以及WebAssembly标准的开放,其安全强度也并非想象中的那么美好。 使用Javascript的混淆器 对于Javascript的混淆器我们是不陌生的,我们常常使用其进行代码的压缩以及混淆以此来减少代码体积并增加人为阅读代码的复杂度。
The x-obs-content-sha256 header can be carried during object or part upload. Its value is a hexadecimal representation of the SHA-256 value of the request body calculated
Convert theargumentsObject to an Array UsingrestParameters in JavaScript Therestparameter allows a function to accept a variable number of arguments as an input. It is represented by...args. Here, in place ofargsyou can give any name, and the triple dots...is known as the spread operator....
Modern JavaScript has many new features that make it easy to write code in a simple and structured manner. One of the handy modern features available in ES6+ is array and object destructuring. JavaScript frameworks like React.js and Angular encourage the use of this technique. So it’s essent...