Function As First Class Citizen

• For the following 3 properties, functions are considered First Class Citizen in Javascript

• We can assign function to variables

  ```js const myVar = function () { return 1; };

  console.log(myVar()); ```

• We can pass function as arguments

  ```js function one() { console.log(1); }

  function two(fn) { fn(); }

  two(one); two(function () { console.log('2'); }); ```

• We can also return function

  ```js function one() { return function two() { console.log(2); }; }

  one()(); ```