Reference Javascript object method when instantiating object

Question

a = function(x){

this.c = x;

this.c();

}

a.prototype.b = function () {

alert("B");

}

a.prototype.c = function () {

//overwrite this

}

var z = new a(this.b);

I know using this.b is wrong but is there anyway I can reference an objects method and pass it as an argument when instantiating the object?

I know the object instance doesn't exist yet but the prototypes do.

I can't paste the context as it's far too complicated I'm afraid. Basically I want to overwrite prototype.b on some occasions and do that at the instantiation point rather than afterwards. Mainly for prettier code. But if can't be done no worries.

Note that this in your var z = new a(this.b) is either the global window object or undefined, replace with a.prototype.b although it's not clear why you would ever actually want to do this. What are you actually trying to accomplish here? — Jared Smith
– Jared Smith, Commented Nov 7, 2017 at 20:01

score 1 · Accepted Answer · 2017-11-07 19:56:08Z

1

You would need to reference it from the constructor.

a = function(x) {
  this.c = x;
  this.c();
}

a.prototype.b = function() {
  alert("B");
}

var z = new a(a.prototype.b);

or maybe it would be nicer to send the name of the desired method, and have the constructor do it.

a = function(x) {
  if (x in a.prototype) {
    this.c = a.prototype[x];
    this.c();
  }
}

a.prototype.b = function() {
  alert("B");
}

var z = new a("b");

edited Nov 7, 2017 at 19:56

answered Nov 7, 2017 at 19:53

user8897421

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1 Comment

user8897421 Over a year ago

If a doesn't yet exist, then how are you invoking?

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