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name: BindableFunction
type: class
memory_category: Instances
summary: |
  An object which allows for synchronous two-way communication between scripts
  on the same side of the client-server boundary. Scripts invoking a
  `Class.BindableFunction` yield until the corresponding callback is found.
description: |
  The **BindableFunction** object allows for synchronous two-way communication
  between scripts on the same side of 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.BindableFunction:Invoke()`. The code invoking the function **yields**
  until the corresponding callback is found, and the callback receives the
  arguments that you passed to `Class.BindableFunction:Invoke()|Invoke()`. If
  the callback was never set, the script that invokes it will not resume
  execution.

  As an alternative for one-way communication between two scripts on the same
  side of the client-server boundary, consider `Class.BindableEvent` which does
  **not** yield for a return.

  As stated, `Class.BindableFunction|BindableFunctions` do not allow for
  communication between the server and clients. If you are looking for this
  functionality, use a `Class.RemoteFunction` as outlined in
  [Remote events and callbacks](../../../scripting/events/remote.md).

  See [Bindable events and callbacks](../../../scripting/events/bindable.md) for
  code samples and further details on `Class.BindableFunction`.

  #### 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.BindableFunction` is
  invoked, as well as Luau types such as numbers, strings, and booleans,
  although you should carefully explore the
  [limitations](../../../scripting/events/bindable.md#argument-limitations).
code_samples: []
inherits:
  - Instance
descendants: []
tags: []
deprecation_message: ''
properties: []
methods:
  - name: BindableFunction:Invoke
    summary: |
      Invokes the `Class.BindableFunction` which in turn calls the
      `Class.BindableFunction.OnInvoke|OnInvoke` callback, returning any values
      returned by the callback.
    description: |
      Invokes the `Class.BindableFunction` which in turn calls the
      `Class.BindableFunction.OnInvoke|OnInvoke` callback, returning any values
      returned by the callback. Invocations yield until the corresponding
      callback is found, and if the callback was never set, the script that
      invokes it will not resume execution.

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

      Only one function can be bound to
      `Class.BindableFunction:Invoke()|Invoke()` at a time. If you assign
      multiple functions, only the last one assigned will be used.

      See [Bindable events and callbacks](../../../scripting/events/bindable.md)
      for code samples and further details on
      `Class.BindableFunction:Invoke()|Invoke()`.
    code_samples: []
    parameters:
      - name: arguments
        type: Tuple
        default:
        summary: |
          Values to pass to the `Class.BindableFunction.OnInvoke|OnInvoke`
          callback.
    returns:
      - type: Tuple
        summary: |
          Values returned from the `Class.BindableFunction.OnInvoke|OnInvoke`
          callback.
    tags:
      - Yields
    deprecation_message: ''
    security: None
    thread_safety: Unsafe
    capabilities: []
events: []
callbacks:
  - name: BindableFunction.OnInvoke
    summary: |
      Callback for when the `Class.BindableFunction` is invoked with
      `Class.BindableFunction:Invoke()|Invoke()`.
    description: |
      This callback is called when the `Class.BindableFunction` is invoked with
      `Class.BindableFunction:Invoke()|Invoke()`. It can be set multiple times
      but cannot be called directly. Invocations will yield until this callback
      is found and, if it is never set, the script that invoked it will not
      resume execution.

      See [Bindable events and callbacks](../../../scripting/events/bindable.md)
      for code samples and further details on
      `Class.BindableFunction.OnInvoke|OnInvoke`.
    code_samples: []
    parameters:
      - name: arguments
        type: Tuple
        default:
        summary: |
          The parameters sent through
          `Class.BindableFunction:Invoke()|Invoke()`.
    returns:
      - type: Tuple
        summary: |
          Values returned by the callback function.
    tags: []
    deprecation_message: ''
    security: None
    thread_safety: Unsafe
    capabilities: []
    writeCapabilities: []