Svelte – Derived Stores

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Alright guysss… welcome back to Svelte projects… kali ini kita lanjutkan materi svelte kita

pertama edit file stores.js

import { writable } from 'svelte/store';
import { readable, derived } from 'svelte/store';

export const countWritable = writable(0);
export const countAutoSubscriptions = writable(0);

//Readable Store
export const time = readable(new Date(), function start(set) {
	const interval = setInterval(() => {
		set(new Date());
	}, 1000);

	return function stop() {
		clearInterval(interval);
	};
});

//Derived Store
const start = new Date();

export const elapsed = derived(
	time,
	$time => Math.round(($time - start) / 1000)
);

dan import lagi ke App.svelte

<main>
	<h1>Hello {name}!</h1>
	<p>Visit the <a href="https://svelte.dev/tutorial">Svelte tutorial</a> to learn how to build Svelte apps.</p>
	<Counter />
	<Toggle />
	<Img />
	<String />
	<Statement />
	<Condition />
	<Nested answer={42}/>
	<Nested/>
	<Info {...pkg}/>
	<IfLogin />
	<Comparison />
	<EachYoutube />
	<KeyEachThing />
	<GenerateNumber />
	<MouseMove />
	<MouseMoveInlineHandler />
	<EventModifier />
	<AlertCompEvent />
	<AlertEventForwarding />
	<CustomButtonComp />
	<TextInput />
	<NumericInput />
	<CheckboxInputs />
	<GroupInputs />
	<TextareaInputs />
	<FileInput />
	<SelectBindings />
	<SelectMultiple />
	<EachBlockBindings />
	<MediaElements />
	<Dimensions />
	<BindThisCanvas />
	<ComponentBindings />
	<OnMount />
	<OnDestroyIntervals />
	<BeforeAndAfterUpdate />
	<Tick />
	<h1>The count is {countValue}</h1>
	<Incrementer/>
	<Decrementer/>
	<Resetter/>
	<h1>The count is {$countAutoSubscriptions}</h1>
	<IncrementerAutoSubscriptions/>
	<DecrementerAutoSubscriptions/>
	<ResetterAutoSubscriptions/>
	<h1>The time is {formatter.format($time)}</h1>
	<h1>The time is {formatter.format($time)}</h1>
	<p>
		This page has been open for
		{$elapsed} {$elapsed === 1 ? 'second' : 'seconds'}
	</p>

</main>

Hasilnya…

Okay berhasil ya… kita sudahi dulu… link github ada disini… cyaaa….