What is this

this.js

const root =  (typeof window === 'undefined')  ? global : window;

function LambdaClosure() {

    return () => {
	if ( this == root )
	    console.log('Closure: this is global/window');
	else
	    console.log('Closure: this is ', this.name);
    };
}

function LambdaFunction() {    
    return function () {
	if ( this == root )
	    console.log('Function: this is global/window');
	else
	    console.log('Function: this is ', this.name);
    };
    
}


console.log("---- take 1 -----")
LambdaFunction()()
LambdaClosure()()

console.log("---- take 2 -----")
let obj = { name: 'first' };
obj.f = LambdaFunction;
obj.c = LambdaClosure;
obj.f()()
obj.c()()

console.log("---- take 3 -----")
let obj2 = { name: 'second' };
obj2.f = LambdaFunction();
obj2.c = LambdaClosure();
obj2.f()
obj2.c()

console.log("---- take 4 -----")
let obj3 = { name: 'third' };
let obj4 = { name: 'fourth' };
obj3.f = LambdaFunction
obj3.c = LambdaClosure
obj4.f = obj3.f();
obj4.c = obj3.c();
obj4.f()
obj4.c()