Package org.mozilla.javascript

## Interface Function

- All Superinterfaces:
    `Callable`, `Constructable`, `Scriptable`
  All Known Implementing Classes:
    `ArrowFunction`, `BaseFunction`, `BoundFunction`, `Delegator`, `FunctionObject`, `IdFunctionObject`, `IdFunctionObjectES6`, `LambdaConstructor`, `LambdaFunction`, `NativeContinuation`, `NativeFunction`, `NativeJavaClass`, `NativeJavaConstructor`, `NativeJavaMethod`, `NativeJavaTopPackage`, `Require`, `Synchronizer`

      public interface Function
      extends Scriptable, Callable, Constructable

  This is interface that all functions in JavaScript must implement. The interface provides for calling functions and constructors.
  See Also:
    `Scriptable`

- - ### Field Summary

    - ### Fields inherited from interface org.mozilla.javascript.Scriptable

      `NOT_FOUND`

  - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `java.lang.Object` | `call​(Context cx, Scriptable scope, Scriptable thisObj, java.lang.Object[] args)` | Call the function.
    `Scriptable` | `construct​(Context cx, Scriptable scope, java.lang.Object[] args)` | Call the function as a constructor.

    - ### Methods inherited from interface org.mozilla.javascript.Scriptable

      `delete, delete, get, get, getClassName, getDefaultValue, getIds, getParentScope, getPrototype, has, has, hasInstance, put, put, setParentScope, setPrototype`

- - ### Method Detail

    - #### call

          java.lang.Object call​(Context cx,
                                Scriptable scope,
                                Scriptable thisObj,
                                java.lang.Object[] args)

      Call the function.

      Note that the array of arguments is not guaranteed to have length greater than 0.

      Specified by:
        `call` in interface `Callable`
      Parameters:
        `cx` - the current Context for this thread
        `scope` - the scope to execute the function relative to. This is set to the value returned by getParentScope() except when the function is called from a closure.
        `thisObj` - the JavaScript `this` object
        `args` - the array of arguments
      Returns:
        the result of the call

    - #### construct

          Scriptable construct​(Context cx,
                               Scriptable scope,
                               java.lang.Object[] args)

      Call the function as a constructor.

      This method is invoked by the runtime in order to satisfy a use of the JavaScript `new` operator. This method is expected to create a new object and return it.

      Specified by:
        `construct` in interface `Constructable`
      Parameters:
        `cx` - the current Context for this thread
        `scope` - an enclosing scope of the caller except when the function is called from a closure.
        `args` - the array of arguments
      Returns:
        the allocated object