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.call(singer);
    }
}
singer.songs();