ارائه رونز

شمارنده

import { writable(alias) function writableT>(value?: T | undefined, start?: StartStopNotifierT> | undefined): WritableT>
import writable
Create a Writable store that allows both updating and reading by subscription.
value 
initial value
 } from 'svelte/store';

export function createCounterfunction createCounter(): {
    subscribe: (this: void, run: Subscribernumber>, invalidate?: () => void) => Unsubscriber;
    increment: () => void;
}() {
	const { subscribeconst subscribe: (this: void, run: Subscribernumber>, invalidate?: () => void) => Unsubscriber
Subscribe on value changes.
, updateconst update: (this: void, updater: Updaternumber>) => void
Update value using callback and inform subscribers.
 } = writable(alias) writablenumber>(value?: number | undefined, start?: StartStopNotifiernumber> | undefined): Writablenumber>
import writable
Create a Writable store that allows both updating and reading by subscription.
value 
initial value
(0);

	return {
		subscribe(property) subscribe: (this: void, run: Subscribernumber>, invalidate?: () => void) => Unsubscriber,
		increment(property) increment: () => void: () => updateconst update: (this: void, updater: Updaternumber>) => void
Update value using callback and inform subscribers.
updater 
callback
((n(parameter) n: number) => n(parameter) n: number + 1)
	};
}

counter.svelte

import { writable } from 'svelte/store';

export function createCounterfunction createCounter(): {
    readonly count: number;
    increment: () => number;
}() {
	const { subscribe, update } = writable(0);
	let countlet count: number = $statefunction $state0>(initial: 0): 0 (+1 overload)
namespace $state
Declares reactive state.
Example:
{@link https://svelte.dev/docs/svelte/$state Documentation}
initial 
The initial value
(0);

	return {
		subscribe,
		increment: () => update((n) => n + 1)
		get count(getter) count: number() { return countlet count: number },
		increment(property) increment: () => number: () => countlet count: number += 1
	};
}

script>
	export let width;
	export let height;

	
	
	$: area = width * height;

	
	
	$: console.log(area);
script>

const multiplyByHeightconst multiplyByHeight: (width: any) => number = (width(parameter) width: any) => width(parameter) width: any * heightany;
$: areaany = multiplyByHeightconst multiplyByHeight: (width: any) => number(widthany);

script>
	let { width, height } = $props(); 

	const area = $derived(width * height);

	$effect(() => {
		console.log(area);
	});
script>