Function grab

grab<T, K extends string | number | symbol>(
    observable: IObservable<T>,
    key: K,
    defaultVal?: T[K],
): IObservable<undefined | T[K]>
compute an observable and return a new Observable that is equal to some property of the original Observable
Type Parameters
- T
- K extends string | number | symbol
Parameters
- observable: IObservable<T>
- key: K
- OptionaldefaultVal: T[K]
Returns IObservable<undefined | T[K]>
- Defined in observables.ts:260