SOURCE

function arr_co(arr1,arr2){
    var co_arr = [];
    if(arr1.length-arr2.length<0){
        for(var i=0;i<arr2.length;i++){
            if(i<=(arr1.length-1)){
                co_arr.push(arr1[i]+'-'+arr2[i]);
            }else{
                co_arr.push(' '+'-'+arr2[i]);
            }
        }
    }else{
       for(var i=0;i<arr1.length;i++){
            if(i<=(arr2.length-1)){
                co_arr.push(arr1[i]+'-'+arr2[i]);
            }else{
                co_arr.push(arr1[i]+'-'+' ');
            }
        } 
    }
    return co_arr;
}
var arr1 = [0,1,2,3,5];
var arr2 = [0,1,2,3];
var coarr = arr_co(arr1,arr2);
console.log(coarr);

*:not(button){
    color:#fff;
}
a:visited{
    color:lightblue
}