Home > @pago/reactive > memoize
memoize() function
Returns a function that is only executed again if any of its tracked values have changed. The controller can be used to establish a notification system and is largely irrelevant to end users of the API.
Signature:
export declare function memoize<T>(fn: () => T, controller?: SubscriptionController): () => T;
Parameters
| Parameter | Type | Description |
|---|---|---|
| fn | () => T | A memoized function. |
| controller | SubscriptionController | A controller that can be used to manage subscribing to tracked values. |
Returns:
() => T
Example
const person = ref('Preact');
const message = memoize(() => `Hello ${person.current}`);
console.log(message()); // => 'Hello Preact'
console.log(message()); // => 'Hello Preact', but this time the memoized function was not executed at all