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JS Function bind()

This example will display a person name after 3 seconds:

const person = {
  firstName:"John",
  lastName: "Doe",
  display: function() {
    let x = document.getElementById("demo");
    x.innerHTML = this.firstName + " " + this.lastName;
  }
}

let display = person.display.bind(person);
setTimeout(display, 3000);