Function update

update<T>(edit): OperatorFunction<T | undefined, Accessor | undefined>
Returns an RxJS operator to edit and update a Resource. It is equivalent to
```
switchMap(resource => of(undefined))
```
if resource is null or undefined and applying edit operation to the resource and doing
```
switchMap(resource => resource.update())
```
otherwise.
Type Parameters
- T extends Resource
Parameters
- edit: ((resource) => T)
  the operation to edit the resource
  - - (resource): T
    - Parameters
      resource: Readonly<T>
      Returns T
Returns OperatorFunction<T | undefined, Accessor | undefined>
a function that transforms the source Observable
- Defined in src/lib/rxjs.ts:144

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