How to implement a destructor in Javascript?

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In languages such as C++, we have the possibility to declare a destructor for a class, so that certain actions are performed when an object of that class is destroyed. How to do this in Javascript? For example:

class minhaClasse {
  constructor(elem){
    this.elem = elem;
    this.elem.addEventListener("click", this.acao);
  }
  acao(){
    document.getElementById("log").innerHTML += "Clicado !<br/>";
  }
  
  destrutor(){
    this.elem.removeEventListener("click", this.acao);
  }
  
}

document.addEventListener("DOMContentLoaded",function(even){ 
  
  var obj = new minhaClasse(document.getElementById("bt"));
document.getElementById("bt2").addEventListener("click",function(){
    obj.destrutor();
    delete obj;
    
  });
});
<button id="bt">Clique</button>
<button id="bt2">Deletar</button>
<div id="log"></div>

You can remove the event without calling the method .destrutor(), ie, this be done automatically when or object is deleted or Garbage-collected?

javascript oop ecmascript-6

1 answer

6


The only way is to call in the same hand. Your code is correct and will have to be so.

There is no resource available in the language that allows this. And as far as I know there is no forecast to have. This is probably a flaw.

See if that helps you. Note that you can save a line, but still need to explicitly delete the object, which is not the same as C++ does.

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