const getRectArea = function (width, height) {
  return width * height;
};

console.log(getRectArea(3, 4));
// Expected output: 12

    var myFunction = function [name]([param1[, param2[, ..., paramN]]]) { statements };

console.log(notHoisted); // undefined
//even the variable name is hoisted, the definition wasn't. so it's undefined.
notHoisted(); // TypeError: notHoisted is not a function

var notHoisted = function () {
  console.log("bar");
};

var math = {
  factit: function factorial(n) {
    console.log(n);
    if (n <= 1) return 1;
    return n * factorial(n - 1);
  },
};

math.factit(3); //3;2;1;

var foo = function () {};
foo.name; // "foo"

var foo2 = foo;
foo2.name; // "foo"

var bar = function baz() {};
bar.name; // "baz"

console.log(foo === foo2); // true
console.log(typeof baz); // undefined
console.log(bar === baz); // false (errors because baz == undefined)

var x = function (y) {
  return y * y;
};

button.addEventListener("click", function (event) {
  console.log("button is clicked!");
});