Edit in JSFiddle

var test1_makers = ['Toyota','Nissan','Honda'];
var test1_maker = test1_makers.join();

var test2_maker = 'Toyota,Nissan,Honda';
var test2_makers = test2_maker.split(',');

$('#test1').html(test1_maker);
$('#test2').html(vardump(test2_makers));

function vardump(arr,lv,key) {
    var dumptxt = "",
        lv_idt = "",
        type = Object.prototype.toString.call(arr).slice(8, -1);
    if(!lv) lv = 0;
    for(var i=0;i<lv;i++) lv_idt += "    ";
    if(key) dumptxt += lv_idt + "[" + key + "] => ";
    
    if(arr == null || arr == undefined){
        dumptxt += arr + '\n';
    } else if(type == "Array" || type == "Object"){
        dumptxt += type + "...{\n";
        for(var item in arr) dumptxt += vardump(arr[item],lv+1,item);
        dumptxt += lv_idt + "}\n";
    } else if(type == "String"){
        dumptxt += '"' + arr + '" ('+ type +')\n';
    }  else if(type == "Number"){
        dumptxt += arr + " (" + type + ")\n";
    } else {
        dumptxt += arr + " (" + type + ")\n";
    }
    return dumptxt;
}

<div id="wrap">
<p>join();</p>
<div id="test1" class="result"></div>
<p>split();</p>
<div id="test2" class="result"></div>
</div>