Question

I trying to understand this piece of code

Function.prototype.method = function (name, fn) {
    this.prototype[name] = fn;
    return this;
};

what does “this” refering to in the function body ?
Is it refering to Function.prototype ?
Is it trying to add a member to
Function.prototype.prototype , namely Function.prototype.prototype[name] ?

Answer 1

Function in Function.prototype are called on Function instances.
Therefore, this refers to the function you called it on.

this.prototype would refer to the prototype of the function you called it on.

For example:

function MyClass() { }
MyClass.method("myMethod", function() { });

var c = new MyClass();
c.myMethod();    //MyClass.prototype.myMethod