The forEach method takes a callback function as an argument. This callback function is executed once for each array element. 

The callback function can take up to three arguments:
 The current element being processed in the array.
 The index of the current element.
 The array that forEach was called upon.

syntax
--
array.forEach(function(element, index, array) {
  // Your code here
});


const fruits = ['apple', 'banana', 'cherry']; // fruits is an array with 3 items
fruits.forEach(	// it is sort of oo (object oriented language), array.forEach ( anonymous function (passIN_parameter){} )
 function(fruit) {
  console.log(fruit);
 }
);

const fruits = ['apple', 'banana', 'cherry'];
fruits.forEach(function(fruit, index) {
  console.log(index + ': ' + fruit);
});