Invocation as Funciton and Method

//Invocation as a function

//this refers to window

function creep() {
    return this;
}
console.log(creep() === window, "Creeping in the window");


var sneak = creep;
console.log(sneak() === window, "Sneaking in the window");


//Invocation as a method
//Function is declared as a mEthod of a Object
//this refers to object that called the Method

var ninja1 = {
    skulk: function () {
        return this;
    }
};

console.log(ninja1.skulk() === ninja1, "The 1st ninja is skulking");

var ninja2 = {
    skulk: creep
};

console.log(ninja2.skulk() === ninja2, "The 2nd ninja is skulking");