The for..of loop only supports iterable objects like arrays, not objects.

To iterate over the values of an object, use:

for (var key in test) {
    var item = test[key];
}

You can use this syntax:

const myObject = {
  first: "one",
  second: "two",
};

for (const [key, value] of Object.entries(myObject)) {
  console.log(key, value);  // first one, second two
}

However, Object.entries has poor support right now does not work in IE or iOS Safari. You'll probably might need a polyfill. See https://caniuse.com/mdn-javascript_builtins_object_entries for the latest scoop.

See also Object.keys to iterate just the keys, or Object.values for just the values.

If you are storing data in a key-value store, please use Map which is explicitly designed for this purpose.

If you have to use an object though, ES2017 (ES8) allows you to use Object.values:

const foo = { a: 'foo', z: 'bar', m: 'baz' };
for (let value of Object.values(foo)) {
    console.log(value);
}

If that isn't supported yet, use a polyfill: Alternative version for Object.values()

And finally if you're supporting an older environment that don't support this syntax, you'll have to resort to using forEach and Object.keys:

var obj = { a: 'foo', z: 'bar', m: 'baz' };
Object.keys(obj).forEach(function (prop) {
    var value = obj[prop];
    console.log(value);
});