createKeyedSignal()

Creates a Signal grouped by a key. Essentially splits the producer and consumer of a Subject for each key.

export function createKeyedSignal<A extends unknown[], T>(
  keySelector?: (signal: T) => K,
  mapper?: (...args: A) => T,
): [(key: K) => GroupedObservable<K, T>, (...args: A) => void]

Arguments

• keySelector?: (Optional) A function that extracts the key from the emitted value. If omitted, it will use the first argument as the key.

• mapper?: (Optional) A function for mapping the arguments of the emitter function into the value of the Observable.

  Defaults to (v: Payload) => v

Returns

[1, 2]:

1. A function that returns the observable for a given key

2. The emitter function

See also

• createSignal()