how to call a javascript function at the end of function without function name code example

Example 1: javascript function

// variable:
var num1;
var num2;
// function:
function newFunction(num1, num2){
	return num1 * num2;
}

Example 2: javascript functions

function sayHelloTo(to) {
  alert(`Hello ${to}`);
}
sayHelloTo('World from Grepper')