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It is recommended to use javascript`s prototype when implementing methods or member variables within functions-classes.

📕 One reason to do that could be the reducing of memory usage.

Here follows two code examples

First code snippet

function MyClass()
{
    this.attribute = true;
}

//Both have an own member variable "attribute"
var MyFirstInstance = new MyClass();
var MySecondInstance = new MyClass();

Second code snippet

function MyClass()
{}

//Here is the difference to the first code snippet
MyClass.prototype.attribute = true;

//Both have no member variable "attribute", but access to the variable "prototype.attribute"
var MyFirstInstance = new MyClass();
var MySecondInstance = new MyClass();

The first code snippet should have more memory demands then the second one. The reason for that it seems is that, that the member variable attribute in the first code snippet exists in both instances (sum is two variables in memory), while in the second code snippet both instances should only have access to the variable prototype.attribute (sum is only one variable in memory).

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Memory Usage Test

STILL IN WORKS!!