JavaScript Function Definitions

JavaScript Function Definitions

1. Named Function Declaration:
  function test () {
    // code
  }
  
2. Anonymous Function Declaration (Usually callbacks)
  array.forEach(function (item){})
  
3. Named Function Expression
  var x = function test (a, b) {return a * b};
  
4. Anonymous Function Expression
  var x = function (a, b) {return a * b};
  
5. Immediately Invoked Function Expression (IIFE)
  (function () {
    var x = "Hello!!";
  })();
  
6. Arrow Functions (ES6)
  array.forEach(item => {})