this

Is there any way to implement preliminary calculations before an invocation of super(...) or this(...) constructor? Consider the following example: public class Test { private final int n; private final int m; private final int[] store; public Test(int n, int m) { /* This is common (most generic) constructor of the class Test. It is desirable to invoke it via this(...) call from any other constructor of this class since it contains some common initialization tasks, which are better to concentrate in one place instead of scattering them throught the class, due to maintainability and security

This question already has an answer here: How to access the correct `this` inside a callback? 10 answers As in, sometimes when I look at code by other people, they will go var self = this; or in jquery for example, go var $self = $(this); is there a particular reason for doing so? It preserves the value of this for use in functions defined inside the current function. // Contrived example var myObject = { func: function () { var self = this; setTimeout(bar, 1000); function bar () { alert(this); // `window` alert(self); // `myObject` } } }; myObject.func(); The particular example (not using

The following code runs for both var = putVar; & this.var = putVar; I understand: "this" is used to identify that - "put this value for just 'my' object". When both work, why do people usually use "this" in setters? code: public class PlayingWithObjects { public static void main(String[] args) { SomeClass classObj = new SomeClass(10); System.out.println("classObj.getVar: " + classObj.getVar() ); classObj.setVar(20); System.out.println("classObj.getVar: " + classObj.getVar() ); classObj = new SomeClass(30); System.out.println("classObj.getVar: " + classObj.getVar() ); } } class SomeClass {

I have private variables in constructor and public variables in the class . I refer to this variables and functions using this keyword. I am getting undefined if I try to access this variables inside this function. I am new to typescript , how can I access this variable inside this function? Technology : Typescript, Angular 2, Angular 1.6.5, JavaScript admin-company-settings.ts import { Component } from '../../../../common/extentions/to-angular2'; import { Http } from '@angular/http'; export class AdminCompanySettings { public company: any; constructor(private $http: ng.IHttpService) { // }

I have fragment where I get the string in List and send it as Bundle to the activity. For Example I get a string and and send it to an activity by following way: public class ViewPagerAdapter extends FragmentStatePagerAdapter { private CharSequence contentTitle[]; public ViewPagerAdapter(Response<album> response) { List<String> listcontentTitle = new ArrayList<>(); List<List<String>> latest_list = new ArrayList<>(); List<String> latestdate = new ArrayList<>(); List<String> latestcomment = new ArrayList<>(); for (int i = 0; i < 5; i++) { listcontentTitle.add(String.valueOf(response.body()

I read "Why and how to bind methods in your React component classes?" and grabbed the basic idea of how different is this by the scopes it gets called. I made a simple class to test this. class Something { constructor(some) { this.some = some; } print() { console.log( "print from ", this, this === undefined ? "!!this is undefined!!" : this.some ); } } From what I understood, the scope of this can be different although it is from the same object (instance). const some = new Something("is"); some.print(); // 'this' is defined. 'this.some' is 'is'. const going = some.print; going(); // 'this' is