Rapid traverse an array

        ARR = var [l, 2,3]; 
        // iterate 
        for (var I = 0; I < ARR .length; I ++) { 
            the console.log (ARR [I]);     
        } 
        
        // flash array traversal 
        for (var item ARR of) { 
            the console.log (Item); 
        } 

       // rapid traverse index 
        for (var Item in ARR) { 
            the console.log (Item); 
        }