let myname ={ firstname: "Fname", lastname: "Lname" } let printName = function () { console.log(this.firstname + " " + this.lastname); } let printMyName = printName.bind(myname); printMyName();

Este código da salida 'Fname Lname'

 let myname ={ firstname: "Fname", lastname: "Lname" } let printName = () => { console.log(this.firstname + " " + this.lastname); } let printMyName = printName.bind(myname); printMyName();

Este código da indefinido para ambas variables.

¿Por qué pasó esto?