CODEWITHSUNDEEP
typescriptconstructorthisstatic-methods
Plankton
Plankton

Reputation: 386

Typescript: Static methods unable to access private properties in constructor

Trying to make a static function give access to a property xdate, which was initialized in the constructor (in typescript 1.5.3).

this.xdate is accessible in all other instance methods. it remains inaccessible in the static method.

Q. Is there anyway I can make this.xdate accessible in the static method?

Below is my code:-

class vehicle{
  constructor(private xdate = new Date()){}

  vroom(){    console.log(this.xdate);  }
  static staticvroom(){ console.log(this.xdate);} //Warning: Property 'xdate' does not exist on type 'typeof vehicle'.


}//vehicle ends

let v1 = new vehicle;
v1.vroom(); //works

vehicle.staticvroom(); //undefined

/* this is how i executed it:- 
D:\js\Ang2\proj2\myforms\tsc_cRAP>tsc 7_.ts
7_.ts(18,42): error TS2339: Property 'xdate' does not exist on type 'typeof vehicle'.

D:\js\Ang2\proj2\myforms\tsc_cRAP>node 7_.js
2017-06-23T09:17:41.365Z
undefined

*/

Any pointers would be of great help. (If this is a repeated question, apologies in advance)

/* UglyHack#1: since static methods are available even before the instance of an object, I created a tmp obj. within staticvroom(){} and it worked.

static staticvroom(){ 
  console.log((new vehicle).xdate); 
}

Not sure the performance issues on this.

*/

Upvotes: 0

Views: 4172

Answers (1)

9me
9me

Reputation: 1138

You need to pass instance as parameter

class Vehicle {
  constructor(private xdate = new Date()) {}
  vroom(){
    console.log(this.xdate);
  }
  static staticVar: Date = new Date();
  static staticvroom(vehicle: Vehicle) {
    console.log(vehicle.xdate);
    console.log(this.staticVar); // You can even access static vars with this
  }


}// vehicle ends

let v1 = new Vehicle;
v1.vroom(); // works

Vehicle.staticvroom(v1);

Upvotes: 4

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