What is the use Function.prototype.apply method?

The apply invokes a function specifying the this or the "owner" object of that function on that time of invocation.

const details = {
  message: 'Hello World!'
};

function getMessage(){
  return this.message;
}

getMessage.apply(details); // returns 'Hello World!'

This method works like Function.prototype.call the only difference is how we pass arguments. In apply we pass arguments as an array.

const person = {
  name: "Marko Polo"
};

function greeting(greetingMessage) {
  return `${greetingMessage} ${this.name}`;
}

greeting.apply(person, ['Hello']); // returns "Hello Marko Polo!"