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

indirectInvo2.js

var singer = {
    name: "Dua Lipa",
    songs: function() {
	    function songAndSinger(){
          console.log(this === singer) // true
        }
        songAndSinger.apply(singer)
    }
}
singer.songs();