48 replies

Using Stream.async to Register Listeners

When the docs say

Stream.async

Stream.async

"Creates a stream from an asynchronous callback that can be called multiple times", does that mean in the following case my I might register this listener more than once?

const usernameStream = pipe(
    getPublicUser,
    Effect.flatMap(usr => Effect.sync(() =>
      Stream.async<never, never, string>(emit =>
        usr.addListener(data => emit.single(data.username ?? ''))
      )
    ))
  )

const usernameStream = pipe(
    getPublicUser,
    Effect.flatMap(usr => Effect.sync(() =>
      Stream.async<never, never, string>(emit =>
        usr.addListener(data => emit.single(data.username ?? ''))
      )
    ))
  )

Effect Community•3y ago•

48 replies

bsluther

Using Stream.async to Register Listeners

When the docs say

Stream.async

Stream.async

"Creates a stream from an asynchronous callback that can be called multiple times", does that mean in the following case my I might register this listener more than once?

const usernameStream = pipe(
    getPublicUser,
    Effect.flatMap(usr => Effect.sync(() =>
      Stream.async<never, never, string>(emit =>
        usr.addListener(data => emit.single(data.username ?? ''))
      )
    ))
  )

const usernameStream = pipe(
    getPublicUser,
    Effect.flatMap(usr => Effect.sync(() =>
      Stream.async<never, never, string>(emit =>
        usr.addListener(data => emit.single(data.username ?? ''))
      )
    ))
  )

Using Stream.async to Register Listeners

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