CODE EXAMPLE FOR JAVASCRIPT

each function

function each(coll, func) { 
       if (Array.isArray(coll)) { 
             for (var i = 0; i < coll.length; i++) { 
                   func(coll[i], i); 
             } 
       } else { 
             for (var key in coll) { 
                   func(coll[key], key); 
             } 
       } 
 }