Javascript: forEach over arrays and Objects

foreach.js

// forEach over Arrays
var items = ['fish', 'birds', 'dogs', 'cats'];

items.forEach(function(item, index) { 
  console.log(index + ': ' + item);
});

// forEach over Objects
var h2 = document.getElementsByTagName('h2');
Object.keys(h2).forEach(function(item){ 
  console.log(j2[item]); 
});