29.6. Invoking Script Functions from Java

Try these first

1. 1.

   What is the Invocable interface used for?

   Hint

   Think about calling functions from scripts.

2. 2.

   How do we make a JavaScript function available in Java?

   Hint

   Remember the engine we discussed.

3. 3.

   What is the purpose of the Invocable interface?

   • To evaluate scripts
   • To invoke script functions
   • To manage script bindings

   Hint

   Think about function interaction capabilities.

4. 4.

   True or False: The greet function can be called from Java if it is not evaluated.

   • True
   • False

   Hint

   Remember the sequence of actions required.

5. 5.

   Define a JavaScript function that calculates the factorial of a number. Write Java code to invoke this function for the number 5.

   Hint

   Think about how recursion works.

6. 6.

   Create a script where a user can input a mathematical operation (addition, subtraction), and the Java program invokes this based on user input.

   Hint

   Consider how you accept parameters and use conditional checks.