JavaScript `for ... in ... xxx.hasOwnProperty`

gistfile1.js

var a = {
    '0': 3,
    '3': 5,
    '10': 8
};

function fn(dics, num) {
    var resp = null;
    var keys = Object.keys(dics);
    console.log("----------");
    console.log("num:", num);
    // console.log("dics:", dics);
    // console.log("keys:", keys);
    for (var key in keys) { // `key` is a numeric index of keys here. [0,1,2,...]
        // console.log("key (index):", key);
        if (dics.hasOwnProperty(keys[key])) {
            if (num >= Number(keys[key])) {
                resp = dics[Number(keys[key])];
                // console.log(num, ">=", Number(keys[key]));
                console.log("resp:", resp);
            };
        };
    };
    // console.log(resp);
    return resp;
}

var i = 12;
while (i-- > 0) {
    console.log(fn(a, i));
}