do javascript constructor function creates an object called this and return it?

Question

As of my knowledge, constructor function are just like normal functions (For convention we just uppercasing it). When we prefix it with new it becomes a constructor function which creates an object and returns it

function Foo(prop){
let this = {};
this.prop=prop;
return this;
}

Is this actually happens internally when we try to add a new keyword before any function.