Stores /
a. Basics b. Adding data c. Dynamic attributes d. Styling e. Nested components f. Making an app a. Assignments b. Declarations c. Statements d. Updating arrays and objects a. Declaring props b. Default values c. Spread props a. If blocks b. Else blocks c. Else-if blocks d. Each blocks e. Keyed each blocks f. Await blocks a. DOM events b. Inline handlers c. Event modifiers d. Component events e. Event forwarding f. DOM event forwarding a. Text inputs b. Numeric inputs c. Checkbox inputs d. Group inputs e. Textarea inputs f. Select bindings g. Select multiple h. Contenteditable bindings i. Each block bindings j. Media elements k. Dimensions l. This m. Component bindings n. Binding to component instances a. onMount b. onDestroy c. beforeUpdate and afterUpdate d. tick a. Writable stores b. Auto-subscriptions c. Readable stores d. Derived stores e. Custom stores f. Store bindings a. Tweened b. Spring a. The transition directive b. Adding parameters c. In and out d. Custom CSS transitions e. Custom JS transitions f. Transition events g. Local transitions h. Deferred transitions i. Key blocks a. The animate directive a. The use directive b. Adding parameters a. The class directive b. Shorthand class directive c. Inline styles d. The style directive a. Slots b. Slot fallbacks c. Named slots d. Checking for slot content e. Slot props a. setContext and getContext a. <svelte:self> b. <svelte:component> c. <svelte:element> d. <svelte:window> e. <svelte:window> bindings f. <svelte:document> g. <svelte:body> h. <svelte:head> i. <svelte:options> j. <svelte:fragment> a. Sharing code b. Exports a. The @debug tag b. HTML tags a. Congratulations!
You can create a store whose value is based on the value of one or more other stores with derived. Building on our previous example, we can create a store that derives the time the page has been open:
export const elapsed = derived ( time , $time => Math .round (($time - start) / 1000 ) );
It's possible to derive a store from multiple inputs, and to explicitly set a value instead of returning it (which is useful for deriving values asynchronously). Consult the API reference for more information.
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