index.js

var arr = new Array(100000);                                                    
for (var x = 0; x < arr.length; x++) {                                          
    arr[x] = 1;                                                                 
}                                                                               
                                                                                
console.time("for");                                                            
for (var x = 0; x < arr.length; x++) {                                          
    console.error(arr[x]);                                                      
}                                                                               
console.timeEnd("for");                                                         
                                                                                
console.time("forEach");                                                        
arr.forEach(function (x) {                                                      
    console.error(x);                                                           
});                                                                             
console.timeEnd("forEach");