Revealing the mystery behind this - https://readosapien.com/revealing-the-mystery-behind-this

bind6.js

let song1 = {
    song: 'Blank Space',
    getSong: function() {
        console.log(this.song);
    }
};
let song2 = {
    song: 'Levitating',
};
let song3 = {
    song: 'Uptown Funk'
}

let song = song1.getSong.bind(song2);
song(); // Levitating
console.log(song.call(song3)); // Levitating
console.log(song.apply(song3)); // Levitating
console.log(song.bind(song3)()); // Levitating