// "use strict";
const user = {
    name: "Oleg",
    one: () => {
         return () => {
            console.log(this);
         };
    },
    two: function () {
        return () => {
            console.log(this);
        };
    },
    three: function red() {
        return function () {
            console.log(this);
        };
    },
    four: () => {
        return function () {
            console.log(this);
        };
    },
};
 
user.one()() //
user.two()(); //
user.three()() //
user.four()() //

// "use strict";
const user = {
    name: "Oleg",
    one: () => {
        console.log(this);
    },
    two: function () {
        return () => {
            console.log(this);
        };
    },
    three: function red() {
        return function () {
            console.log(this);
        };
    },
    four: () => {
        return function () {
            console.log(this);
        };
    },
};
 
user.one()() // undefined
user.two()(); // user {}
user.three()() // undefined
user.four()() // undefined