Hiring guide for Object Pascal Engineers

Object Pascal Developer Hiring Guide

Object Pascal is a high-level, compiled, strongly typed programming language that extends the traditional Pascal language with object-oriented programming capabilities. It was developed by Apple Computer and Borland in the 1980s as a way to add object-oriented constructs to the popular Pascal language. Object Pascal is known for its robustness, efficiency and good performance, which makes it used in various software development areas such as desktop applications, system utilities, databases, high-performance servers and embedded systems. It also provides support for features like classes, inheritance and polymorphism making it easier to design complex data structures and algorithms.

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

First 20 minutes

General Object Pascal app knowledge and experience

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

How would you declare a variable in Object Pascal?
You declare a variable in Object Pascal using the 'var' keyword followed by the variable name and its type. For example: 'var x: Integer;'
What are the basic data types in Object Pascal?
The basic data types in Object Pascal include Integer, Real, Char, String, Boolean, Pointer, and Array.
Describe the difference between 'var', 'const', and 'type' in Object Pascal.
'var' is used to declare variables, 'const' is used to declare constants, and 'type' is used to declare new data types.
How would you define a procedure in Object Pascal?
A procedure in Object Pascal is defined using the 'procedure' keyword followed by the procedure name and parameters in parentheses. For example: 'procedure MyProcedure(x: Integer);'
What are the control structures available in Object Pascal?
Control structures in Object Pascal include conditional statements like 'if', 'case', and loop structures like 'for', 'while', and 'repeat'.
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What you’re looking for early on

Does the candidate have a solid understanding of Object Pascal language?
Has the candidate demonstrated problem-solving skills?
Is the candidate familiar with the software development life cycle?
Can the candidate work well in a team?

Next 20 minutes

Specific Object Pascal 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.

Describe the difference between a procedure and a function in Object Pascal.
A procedure is a block of code that performs a specific task but does not return a value, while a function is similar to a procedure but it returns a value.
How would you handle exceptions in Object Pascal?
Exceptions in Object Pascal are handled using the 'try...except' statement. The code that might raise an exception is put in the 'try' block and the code to handle the exception is put in the 'except' block.
What are the principles of Object-Oriented Programming (OOP) in Object Pascal?
The principles of OOP in Object Pascal include encapsulation, inheritance, and polymorphism.
Describe the difference between public, private, and protected visibility in Object Pascal.
Public members can be accessed from anywhere, private members can only be accessed from within the same unit, and protected members can be accessed from within the same unit and from subclasses.
How would you create a class in Object Pascal?
A class in Object Pascal is created using the 'type' keyword followed by the class name and the 'class' keyword. For example: 'type MyClass = class...end;'
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The ideal back-end app developer

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

At this point, a skilled Object Pascal engineer should demonstrate strong problem-solving abilities, proficiency in Object Pascal 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 Object Pascal.

What does the following simple Object Pascal code do?
program HelloWorld;
  WriteLn('Hello, World!');
This code will print 'Hello, World!' to the console.
What will be the output of the following code?
program RepeatUntilDemo;
  a: integer;
  a := 10;
    a := a + 1;
  until a = 15;
This code will print the numbers from 10 to 14. The repeat-until loop continues until the condition (a = 15) is met.
What does the following Object Pascal code do?
program ArrayDemo;
  arr: array[1..5] of integer;
  i: integer;
  for i := 1 to 5 do
    arr[i] := i * 2;
  for i := 1 to 5 do
This code initializes an array with the first five multiples of 2 and then prints these values.
What does the following Object Pascal code do?
program ThreadDemo;
  TMyThread = class(TThread)
    procedure Execute; override;
procedure TMyThread.Execute;
  WriteLn('Thread executed.');
  with TMyThread.Create(True) do
    FreeOnTerminate := True;
This code creates a new thread and executes it. The thread prints 'Thread executed.' when it runs.

Wrap-up questions

Final candidate for Object Pascal 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 Object Pascal application deployments. Inquire about their experience in handling system failures and their approach to debugging and troubleshooting.

What are constructors and destructors in Object Pascal?
Constructors and destructors in Object Pascal are special methods that are called when an object is created and destroyed. They are defined using the 'constructor' and 'destructor' keywords.
Describe the difference between overloading and overriding in Object Pascal.
Overloading is when multiple procedures or functions have the same name but different parameters, while overriding is when a subclass provides a different implementation of a method that is already provided by its superclass.
How would you implement inheritance in Object Pascal?
Inheritance in Object Pascal is implemented by declaring a new class as a subclass of an existing class using the 'type' keyword and the 'class' keyword. For example: 'type MySubClass = class(MySuperClass)...end;'

Object Pascal application related

Product Perfect's Object Pascal development capabilities

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