What is the purpose of "constructor" method in javascript?

What is the purpose of "constructor" method in javascript?

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What is the purpose of "constructor" method in javascript?
Tag : javascript , By : harley.holt
Date : January 11 2021, 03:34 PM

I think the issue was by ths following , Do not forget that there's no real class in javascript. If you try to transpile your class, you will get something similar to:
var Cat = function () {
  function Cat(name, color) {
    this.name = name;
    this.color = color;

  Cat.prototype.speak = function speak() {

  return Cat;

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Java- Use two double arrays as inputs for the constructor "Polygon" to use the method "contains"

Tag : java , By : ap.
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further There is a contains(double x, double y) in Polygon and Path2D.Double.

What is the purpose of Parameter "token" in "Register" method at MVVM Light framework

Tag : development , By : user186831
Date : March 29 2020, 07:55 AM
it fixes the issue It seems to be a way you can subdivide messages, so that messages with a certain token only arrive at the receivers which also use that token:
From http://blog.galasoft.ch/archive/2010/03/16/whatrsquos-new-in-mvvm-light-v3.aspx:

Purpose of "code" kwarg in ValidationError constructor

Tag : python , By : FarmerDave
Date : March 29 2020, 07:55 AM
around this issue In the Source Code, it says that it is because Python2 had a message attribute, so they can't duck type on it, so they used code instead for compatibility. Here's the Source Code link:

Execute "static" method of a parent of a constructor accessed from a constructor array in Javascript

Tag : javascript , By : user109285
Date : March 29 2020, 07:55 AM
hope this fix your issue Since you only need to work with Chrome, I'd suggest to use ES6 class syntax which does all the inheritance properly, without the chance to mess up. This includes your Action1 constructor to inherit properties ("static class members") from the Action constructor as you'd expect.
class Action {
    constructor() {
        this.targets = [];
        this.used = [];
    execute(player) {
        return whatever;
    static init(player) {
        var a = new this(); // no .constructor
        return a.execute(player);
    static checkRequirements() {
        return true;

class Action1 {
    execute(player) {
        return whateverelse;

ObjectMapper throws exception: "no single-String constructor/factory method", due to "nillable" attr

Tag : development , By : Tamizhvendan
Date : March 29 2020, 07:55 AM
help you fix your problem I need help to solve/fix the cause of the following exception... , Apparently, was missing the following instruction...
om.registerModule(new JavaTimeModule());     
            String jsonString = "{\"MySubGroup\":[{\"MyDateTime\":\"2018-02-01T01:01:01.001-05:00\",\"MyDate\":\"2018-02-04\"}]}";
            om = new ObjectMapper();
            om.setPropertyNamingStrategy(new PreservePropertyNameStrategy()); //not available in jackson 2.6.3:  PropertyNamingStrategy.UPPER_CASE);
            mg = om.readValue(jsonString, MyGroup.class);
            MySubGroupType sgt = mg.getMySubGroup().get(0);
            String jsonString = "{\"MySubGroup\":[{\"MyDateTime\":\"2018-02-01T01:01:01.001-05:00\",\"MyDate\":\"2018-02-04\"}]}";
            om = new ObjectMapper();
            om.registerModule(new JavaTimeModule()); //<=== changed
            om.setPropertyNamingStrategy(new PreservePropertyNameStrategy()); //not available in jackson 2.6.3:  PropertyNamingStrategy.UPPER_CASE);
            mg = om.readValue(jsonString, MyGroup.class);
            MySubGroupType sgt = mg.getMySubGroup().get(0);
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