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name: RemoteFunction
type: class
memory_category: Instances
summary: |
  An object which facilitates synchronous, two-way communication across the
  client-server boundary. Scripts invoking a `Class.RemoteFunction` yield until
  they receive a response from the recipient.
description: |
  The **RemoteFunction** object facilitates synchronous, two-way communication
  across the [client-server](../../../projects/client-server.md) boundary. You
  can use it to define a custom callback function and invoke it manually by
  calling `Class.RemoteFunction:InvokeClient()` or
  `Class.RemoteFunction:InvokeServer()`. The code invoking the function
  **yields** until it receives a response from the recipient.

  In order for both the server and clients to access a `Class.RemoteFunction`
  instance, it must be in a place where both sides can see it, such as
  `Class.ReplicatedStorage`, although in some cases it's appropriate to store it
  in `Class.Workspace` or inside a `Class.Tool`.

  If the result is **not** needed, it is recommended that you use a
  `Class.RemoteEvent` instead, since its call is asynchronous and doesn't need
  to wait for a response to continue execution. See
  [Remote Events and Callbacks](../../../scripting/events/remote.md) for code
  samples and further details on `Class.RemoteFunction`.

  #### Streaming Precautions

  Note that if an invoked `Class.RemoteFunction` creates an instance on the
  server, there is no guarantee that it exists on the client when the function
  returns. This is particularly important in places where instance
  [streaming](../../../workspace/streaming.md) is enabled and when the created
  instances are `Class.BasePart|BaseParts` or `Class.Model|Models`, since parts
  that are far away from the player's character may not be streamed to the
  client, and models that are `Enum.ModelStreamingMode|Atomic` depend on whether
  their parts are streamed. Even if a model is
  `Enum.ModelStreamingMode|Persistent`, there may be some delay between the
  creation of the model and when it is replicated to the client.

  #### Parameter Limitations

  Any type of Roblox object such as an `Datatype.Enum`, `Class.Instance`, or
  others can be passed as a parameter when a `Class.RemoteFunction` is invoked,
  as well as Luau types such as numbers, strings, and booleans, although you
  should carefully explore the
  [limitations](../../../scripting/events/remote.md#argument-limitations).
code_samples: []
inherits:
  - Instance
descendants: []
tags: []
deprecation_message: ''
properties: []
methods:
  - name: RemoteFunction:InvokeClient
    summary: |
      Invokes the `Class.RemoteFunction` which in turn calls the
      `Class.RemoteFunction.OnClientInvoke|OnClientInvoke` callback.
    description: |
      Invokes the `Class.RemoteFunction` which in turn calls the
      `Class.RemoteFunction.OnClientInvoke|OnClientInvoke` callback. Since this
      method is used to communicate from the server to a client, it will only
      work when used in a `Class.Script`.

      Any type of Roblox object such as an `Datatype.Enum`, `Class.Instance`, or
      others can be passed as a parameter to
      `Class.RemoteFunction:InvokeClient()|InvokeClient()`, as well as Luau
      types such as numbers, strings, and booleans, although you should
      carefully explore the
      [limitations](../../../scripting/events/remote.md#argument-limitations).

      See [Remote Events and Callbacks](../../../scripting/events/remote.md) for
      code samples and further details on `Class.RemoteFunction`.

      #### Warning

      In practice, the server does not often invoke the client, as clients
      typically do not have information that the server doesn't have, and
      actions that only a client can take, such as displaying a GUI, typically
      do not require a callback. As such, `Class.RemoteEvent:FireClient()` is
      recommended as an asynchronous method that doesn't need to wait for a
      response to continue execution.

      If you legitimately need to invoke a client from the server, note the
      following risks:

      - If the client throws an error, the server throws the error too.
      - If the client disconnects while it's being invoked,
        `Class.RemoteFunction:InvokeClient()|InvokeClient()` throws an error.
      - If the client doesn't return a value, the server yields forever.
    code_samples: []
    parameters:
      - name: player
        type: Player
        default:
        summary: |
          The `Class.Player` associated with the client to invoke.
      - name: arguments
        type: Tuple
        default:
        summary: |
          Values to pass to the
          `Class.RemoteFunction.OnClientInvoke|OnClientInvoke` callback.
    returns:
      - type: Tuple
        summary: |
          Values returned from the
          `Class.RemoteFunction.OnClientInvoke|OnClientInvoke` callback.
    tags:
      - Yields
    deprecation_message: ''
    security: None
    thread_safety: Unsafe
    capabilities:
      - RemoteEvent
  - name: RemoteFunction:InvokeServer
    summary: |
      Invokes the `Class.RemoteFunction` which in turn calls the
      `Class.RemoteFunction.OnServerInvoke|OnServerInvoke` callback.
    description: |
      Invokes the `Class.RemoteFunction` which in turn calls the
      `Class.RemoteFunction.OnServerInvoke|OnServerInvoke` callback. Since this
      method is used to communicate from a client to the server, it will only
      work when used in a `Class.LocalScript`.

      If a returned result is not needed, it's recommended to use
      `Class.RemoteEvent:FireServer()` instead, as its call is asynchronous and
      doesn't need to wait for a response to continue execution.

      Any type of Roblox object such as an `Datatype.Enum`, `Class.Instance`, or
      others can be passed as a parameter to
      `Class.RemoteFunction:InvokeServer()|InvokeServer()`, as well as Luau
      types such as numbers, strings, and booleans, although you should
      carefully explore the
      [limitations](../../../scripting/events/remote.md#argument-limitations).

      See [Remote Events and Callbacks](../../../scripting/events/remote.md) for
      code samples and further details on `Class.RemoteFunction`.
    code_samples: []
    parameters:
      - name: arguments
        type: Tuple
        default:
        summary: |
          Values to pass to the
          `Class.RemoteFunction.OnServerInvoke|OnServerInvoke` callback.
    returns:
      - type: Tuple
        summary: |
          Values returned from the
          `Class.RemoteFunction.OnServerInvoke|OnServerInvoke` callback.
    tags:
      - Yields
    deprecation_message: ''
    security: None
    thread_safety: Unsafe
    capabilities:
      - RemoteEvent
events: []
callbacks:
  - name: RemoteFunction.OnClientInvoke
    summary: |
      Callback for when the `Class.RemoteFunction` is invoked with
      `Class.RemoteFunction:InvokeClient()|InvokeClient()`.
    description: |
      This callback is called when the `Class.RemoteFunction` is invoked with
      `Class.RemoteFunction:InvokeClient()|InvokeClient()`. When the bound
      function returns, the returned values are sent back to the calling server.

      See [Remote Events and Callbacks](../../../scripting/events/remote.md) for
      code samples and further details on
      `Class.RemoteFunction.OnClientInvoke|OnClientInvoke`.
    code_samples: []
    parameters:
      - name: arguments
        type: Tuple
        default:
        summary: |
          The parameters sent through
          `Class.RemoteFunction:InvokeClient()|InvokeClient()`.
    returns:
      - type: Tuple
        summary: |
          Values returned by the callback function.
    tags: []
    deprecation_message: ''
    security: None
    thread_safety: Unsafe
    capabilities:
      - RemoteEvent
    writeCapabilities: []
  - name: RemoteFunction.OnServerInvoke
    summary: |
      Callback for when the `Class.RemoteFunction` is invoked with
      `Class.RemoteFunction:InvokeServer()|InvokeServer()`.
    description: |
      This callback is called when the `Class.RemoteFunction` is invoked with
      `Class.RemoteFunction:InvokeServer()|InvokeServer()`. When the bound
      function returns, the returned values are sent back to the calling client.

      See [Remote Events and Callbacks](../../../scripting/events/remote.md) for
      code samples and further details on
      `Class.RemoteFunction.OnServerInvoke|OnServerInvoke`.
    code_samples: []
    parameters:
      - name: player
        type: Player
        default:
        summary: |
          The `Class.Player` associated with the client that the
          `Class.RemoteFunction:InvokeServer()|InvokeServer()` call originates
          from.
      - name: arguments
        type: Tuple
        default:
        summary: |
          The parameters sent through
          `Class.RemoteFunction:InvokeServer()|InvokeServer()`.
    returns:
      - type: Tuple
        summary: |
          Values returned by the callback function.
    tags: []
    deprecation_message: ''
    security: None
    thread_safety: Unsafe
    capabilities:
      - RemoteEvent
    writeCapabilities: []