JavaScript : what does it mean to have brackets () after array[]?

Question

I am new to JS, and I have read a code that contains this line.

this.myArray[index](this._sender, args);

I wonder what it means?

Answer 1

It means that this array item is a function, and it is being called with arguments this._sender and args.

In this example, I declare an array, push a single-argument function to it, and call it.

var arr = [];

arr.push(function(str) {
  document.body.innerHTML = "Hey, " + str;
});

arr[0]("Your name");