I see at least one issue with your requires. monster.js first line is const miniMonster = require(“./minimonster.js”); minimonster.js first line is const monster = require(“./monster.js”); This is a problem, you can not have both files evaluate at the same time. I would not require minimonster from monster.js This may fix your issue.
Move the JSDoc for someProperty into the constructor where it is first defined: /** * SomeClass is an example class for my question. * @class * @constructor * @public */ class SomeClass { constructor () { /** * someProperty is an example property that is set to `true` * @type {boolean} * @public */ this.someProperty … Read more
Immediately instantiated anonymous class — is it a bad idea? Yes, a very bad one. Just as bad as new function() { … } was in ES5. This writing style leads to the creation of a new constructor function and prototype object every time the expression is evaluated. If you create multiple objects with this … Read more
I think the simplest way to check if the function is ES6 class is to check the result of .toString() method. According to the es2015 spec: The string representation must have the syntax of a FunctionDeclaration FunctionExpression, GeneratorDeclaration, GeneratorExpression, ClassDeclaration, ClassExpression, ArrowFunction, MethodDefinition, or GeneratorMethod depending upon the actual characteristics of the object So the … Read more
You can use toJSON method to customise the way your class serialises to JSON: class MyClass { constructor(property) { this.property = property } set property(prop) { // Some validation etc. this._property = prop } get property() { return this._property } toJSON() { return { property: this.property } } }
Your class has no static variables (if by static variable you mean static property). getCount returns NaN (after you call increaseCount) because Animal has no count property initially. Then increaseCount does undefined + 1 which is NaN. Instances created by new Animal have a count property initially, but Animal itself does not until you call … Read more
As with any other object you want to stringify in JS, you can use JSON.stringify: JSON.stringify(yourObject); class MyClass { constructor() { this.foo = 3 } } var myClass = new MyClass() console.log(JSON.stringify(myClass)); Also worth noting is that you can customize how stringify serializes your object by giving it a toJSON method. The value used to … Read more
class Game{ constructor(){} } Game.cards = []; Game.cards.push(1); console.log(Game.cards); You can define a static variable like that.
EDIT (2021): TC39, which specifies JavaScript still hasn’t resolved exactly how this is supposed to work. That needs to happen before browsers can consistently implement it. You can follow the latest efforts here. Original answer: Instantiating such classes is meant to work; Chrome and Firefox just have bugs. Here’s Chrome’s, here’s Firefox’s. It works fine … Read more
I was getting this error due to a circular dependency, like A injected with B B injected with C C injected with A Removing the circular dependecy fixed this error.