Arrays and Objects In Prototypes - Not Treated as References

Question

I have a prototype object in Javascript, when I initialise a new instance of the prototype and update properties in the prototype, it updates for all elements. I understand that

Answer 1

Define the array on the instance instead of on the prototype:

function Test() {
    this.array = [];
}

Test.prototype.add = function (value) {
    this.array.push(value)
}