define "this" in named function javascript code example

Example 1: function expression javascript

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

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

Example 2: javascript function declaration

//Four ways to declare a function
function add(a, b) {
  return a + b;
}

var add = function(a, b) {
  return a + b;
}

var add = (a, b) => {
  return a + b;
}

var add = (a, b) => a + b;