var arr = [1, 2, 3]; for (var i = 0; i < arr.length; i++) { console.log(arr[i]); } console.log("---------------------"); for(var item of arr) { console.log(item); } console.log("---------------------"); arr.forEach(function(item,index,self){ console.log(item); console.log(index); }) console.log("---------------------"); arr.map(function(item,index,self){ console.log(item); console.log(index); })