Javascript access to static child attributes

Question

i have this situation

import assert from 'assert'

class A {
    static x = 0

    static a () {
        return A.x
    }
}

class B extends A {
    static x = 1
}

assert.equal(B.a(), 1)

i need to retrive static value in derived class from base class in Js es6. but, i can't find a way,

the assertion will fails with

AssertionError [ERR_ASSERTION]: 0 == 1

what's the right way to do this?

thanks

You're asking for `A.x`, what other value could it give you? Try `this.x`. — Blorgbeard, Nov 24 '17 at 21:57
It seems to work: https://repl.it/repls/IndolentNeighboringRhesusmonkey — Blorgbeard, Nov 24 '17 at 21:59
You can use `this` in a static method, it will refer to the class. See: https://stackoverflow.com/a/34056740/369 — Blorgbeard, Nov 24 '17 at 22:01
yes is working. thanks a lot, i did not think about that... :sad: — Giovanni Cardamone, Nov 24 '17 at 22:02

score 1 · Answer 1 · answered Jan 17 '18 at 10:24

1

Here, you're asking for A.x directly. You should call this.x to get A.x when you are on an object of kind A and to get B.x when you are on an object of kind B.

Just make following changes and it should work fine:

static a () {
    return this.x;
}

answered Jan 17 '18 at 10:24

NatNgs

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Javascript access to static child attributes

1 Answers1