Working with timers on the Web: setTimeout and setInterval.

These APIs come in two flavors:

1. a callback style (that more directly mimics the JavaScript APIs), and
2. a Futures and Streams API.

Timeouts

Timeouts fire once after a period of time (measured in milliseconds).

Timeouts with a Callback Function

use gloo_timers::callback::Timeout;

let timeout = Timeout::new(1_000, move || {
    // Do something after the one second timeout is up!
});

// Since we don't plan on cancelling the timeout, call `forget`.
timeout.forget();

Timeouts as Futures

With the futures feature enabled, a future module containing futures-based timers is exposed.