Statements

We’re not limited to declaring reactive values — we can also run arbitrary statements reactively. For example, we can log the value of count whenever it changes:

$: console.log(`the count is ${count}`);

You can easily group statements together with a block:

$: {
    console.log(`the count is ${count}`);
    alert(`I SAID THE COUNT IS ${count}`);
}

You can even put the $: in front of things like if blocks:

$: if (count >= 10) {
    alert(`count is dangerously high!`);
    count = 9;
}