function Label(name, color) {
    this.name = name;
    this.color = color;
}

var workLabel = new Label('work', 'red');
var personalLabel = new Label('personal', 'red');

console.log(workLabel instanceof Label)

localforage.setItem(uuidv4(), workLabel).then(function (workLabel) {
    console.log(workLabel);
}).catch(function (err) {
    console.log(err);
})

localforage.setItem(uuidv4(), personalLabel).then(function (personalLabel) {
    console.log(personalLabel);
}).catch(function (err) {
    console.log(err);
})

localforage.iterate(function(value, key, iterationNumber) {
    // Resulting key/value pair -- this callback
    // will be executed for every item in the
    // database.
    if (value instanceof Label) {
        console.log("teste");
        console.log([key, value]);
    }
}).then(function() {
    console.log('Iteration has completed');
}).catch(function(err) {
    // This code runs if there were any errors
    console.log(err);
});