HTMLInputElement set Array as value

[betazold]

var input = document.createElement('input');
input.type = "text";
document.getElementById('answer-5258595').appendChild(input);
var a = ['1', 2222, {x:3}, [4,6,7], ['lol', 'hui']];
 
for (var i = 0, len = a.length; i < len; i++) {
    var fn = function(index) {
        input.value = a[index];
    };
    fn = fn.bind(window, i);
    setTimeout(fn, 100 + i * 5000);
}

As you can see, objects convert into '[object Object]', and arrays convert into string which consists of their elements joined by ',' (without space).