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**JAPL** is a general-purpose, interpreted, high-level programming language designed for research and education. It was developed at the University of California, San Diego in the early 1980s by a team led by professor William C. Atchison. JAPL is based on the Lisp programming language, but it has a number of features that make it more suitable for teaching, including a simplified syntax and a built-in debugger. JAPL is still in active development, and it is used by students and researchers at universities around the world. **References:** * [JAPL website](https://japl.ucsd.edu/) * [JAPL documentation](https://japl.ucsd.edu/doc/) * [JAPL tutorial](https://japl.ucsd.edu/tut/)

Ask the right questions secure the right JAPL talent among an increasingly shrinking pool of talent.

First 20 minutes

General JAPL app knowledge and experience

The first 20 minutes of the interview should seek to understand the candidate's general background in JAPL application development, including their experience with various programming languages, databases, and their approach to designing scalable and maintainable systems.

How would you define JAPL?

JAPL, or Just Another Programming Language, is a high-level, interpreted, and general-purpose dynamic programming language.

What are the key features of JAPL?

JAPL has several key features including dynamic typing, automatic memory management, and support for multiple programming paradigms, including procedural, object-oriented, and functional programming.

Describe the difference between static and dynamic typing in JAPL.

In static typing, the type of a variable is checked at compile-time. In dynamic typing, like in JAPL, the type is checked at runtime. This means that you can change the type of a variable at any point in your code.

How would you handle exceptions in JAPL?

In JAPL, exceptions can be handled using the try-catch-finally construct. You put the code that might throw an exception in the try block, the code to handle the exception in the catch block, and the code to be executed regardless of whether an exception was thrown or not in the finally block.

What are the different types of errors in JAPL?

There are three types of errors in JAPL: syntax errors, runtime errors, and logic errors. Syntax errors occur when the syntax of the code is incorrect. Runtime errors occur during the execution of the program. Logic errors occur when the program doesn't perform as intended.

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What you’re looking for early on

Has the candidate demonstrated a solid understanding of JAPL?

Can the candidate explain complex JAPL concepts in simple terms?

Does the candidate's experience align with the job requirements?

Has the candidate shown problem-solving skills?

Next 20 minutes

Specific JAPL development questions

The next 20 minutes of the interview should focus on the candidate's expertise with specific backend frameworks, their understanding of RESTful APIs, and their experience in handling data storage and retrieval efficiently.

How would you create a class in JAPL?

In JAPL, you can create a class using the class keyword followed by the name of the class. The properties and methods of the class are defined inside the class.

What are the principles of object-oriented programming in JAPL?

The principles of object-oriented programming in JAPL are encapsulation, inheritance, and polymorphism. Encapsulation is the bundling of data and methods that operate on that data. Inheritance is the ability of a class to inherit properties and methods from another class. Polymorphism is the ability of an object to take on many forms.

Describe the difference between a function and a method in JAPL.

A function is a block of code that performs a specific task and can be called by its name. A method is a function that is associated with an object and can access the data within the object.

How would you implement inheritance in JAPL?

In JAPL, you can implement inheritance by creating a subclass that inherits from a superclass using the extends keyword. The subclass will inherit all the properties and methods of the superclass.

What are the different types of loops in JAPL?

JAPL supports several types of loops including for, while, and do-while loops. A for loop is used when you know how many times you want to iterate. A while loop is used when you want to iterate as long as a condition is true. A do-while loop is similar to a while loop but the condition is checked after the loop has executed.

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At this point, a skilled JAPL engineer should demonstrate strong problem-solving abilities, proficiency in JAPL programming language, and knowledge of software development methodologies. Red flags include lack of hands-on experience, inability to articulate complex concepts, or unfamiliarity with standard coding practices.

Digging deeper

Code questions

These will help you see the candidate's real-world development capabilities with JAPL.

What does the following JAPL code do?
val list = List(1, 2, 3, 4, 5)
val sum = list.reduce(_ + _)
This code creates a list of integers and then calculates the sum of its elements using the reduce function.
What will be the output of the following JAPL code?
val str = "Hello, World!"
println(str.reverse)
This code prints the reverse of the string 'Hello, World!', so the output will be '!dlroW ,olleH'.
What does the following JAPL code do?
val list = List(1, 2, 3, 4, 5)
val filteredList = list.filter(_ % 2 == 0)
This code creates a list of integers and then creates a new list that includes only the even numbers from the original list.
What does the following JAPL code do?
import java.util.concurrent._
val executor = Executors.newFixedThreadPool(2)
executor.execute(new Runnable {
  def run() = println("Hello from the thread")
})
This code creates a thread pool with two threads and then executes a new task that prints 'Hello from the thread' to the console.

Wrap-up questions

Final candidate for JAPL Developer role questions

The final few questions should evaluate the candidate's teamwork, communication, and problem-solving skills. Additionally, assess their knowledge of microservices architecture, serverless computing, and how they handle JAPL application deployments. Inquire about their experience in handling system failures and their approach to debugging and troubleshooting.

How would you handle file I/O operations in JAPL?

In JAPL, you can handle file I/O operations using the built-in File class. You can create an instance of the File class and use its methods to open, read, write, and close files.

Describe the difference between multithreading and multiprocessing in JAPL.

Multithreading is the concurrent execution of more than one sequential set (thread) of instructions. Multiprocessing is the use of two or more central processing units (CPUs) within a single computer system. JAPL supports both multithreading and multiprocessing.

How would you implement multithreading in JAPL?

In JAPL, you can implement multithreading by creating a new thread using the Thread class and overriding its run method. You can start the thread by calling its start method.

JAPL application related

Product Perfect's JAPL development capabilities

Beyond hiring for your JAPL engineering team, you may be in the market for additional help. Product Perfect provides seasoned expertise in JAPL projects, and can engage in multiple capacities.

JAPL Consultive assessments

JAPL Application Conversion Assessment JAPL Application Integration Assessment JAPL Data & Database Integration Assessment

Custom JAPL development projects

Custom JAPL App Conversion JAPL Custom App Development Process App UI Design for JAPL Facelifts

Hiring guide for JAPL Engineers

JAPL Developer Hiring Guide

What you’re looking for early on

The ideal back-end app developer

What you’re looking to see on the JAPL engineer at this point.

JAPL Consultive assessments

Custom JAPL development projects