Javascript Is it possible to create a prototype Array of particular object?

Question

Helloworld,

I want to create a prototype of array.

Array.prototype.foo = function(){}

But my prototype must apply only if this array contain only a specific object like "bar" Is it possible to create a prototype like this in javascript? :

Array<bar>.prototype.foo = function(){}

Thank you! James

Answer 1

I think that you can do something similar. The best way that I can think to do is it to decorate the default JavaScript array with an additional function. Below is an example showing a print function working.

let test = ['a', 'b', 'c'];

function decoratedArray(args) {
  let decorated = [...args];
  decorated.print = () => {
    decorated.forEach((arg) => {
      console.log(arg);
    });
  }
  
  return decorated;
}

test = decoratedArray(test);

test.print();