function static storage example

static.js

function myFunc() {
  if (!myFunc.static) myFunc.static = Object.create(null);
  // now we can access this hash every time we call the function, export it along with the function, and it is purely associated with the function
  if (!myFunc.static.x) myFunc.static.x = 0;
  myFunc.static.x++;
  return myFunc.static.x;
}

myFunc();
myFunc();
myFunc();
console.log(myFunc());
// 4