Top 10 Coding Interview Questions

When you’re looking for a new job, one of the first things you need to do is find a coding interview. This is a great way to see if your skillset would fit well into the company you’re interviewing with. But what should you expect? Here are the top 10 coding interview questions that will help assess your skills.

What is a programming language?

A programming language is a step-by-step set of instructions that a computer can understand to create software. There are many different programming languages, but the most common ones are Java, Python, and C++.

Some popular programming languages include:

Java: Java is one of the most popular programming languages in use today. It’s used for developing websites and applications that need to run on computers. Java also has an extensive library of code that makes it easy to write code for specific tasks.

Python: Python is a widely used high-level interpreted language that runs on many platforms, including Windows, Mac OS X, and Linux. It has a large and comprehensive library of tools and modules built in, which makes it easy to write code for specific tasks.

C++: C++ is a powerful object-oriented programming language that gives developers the ability to create sophisticated software systems. Its syntax is difficult for beginners to learn but its power means it’s often used in industry-leading software products.

What are the different types of data structures?

There are several different types of data structures, each with its own advantages and disadvantages.

  1. Heap data structure: A heap data structure is a storage implementation that allows for quick retrieval of elements in the order they were stored. Heaps have faster lookup times than other data structures, but can become fragmented if the number of elements in the heap increases rapidly.
  2.  Linked list: A linked list is a type of data structure used to store ordered lists of elements. The first element in the list is linked to the last element, and each subsequent element is linked to the previous element by a pointer. The linked list has O(1) insertion and deletion time complexity, but can become congested if the size of the list grows large.
  3.  Stack: A stack is a type of data structure used to store variables on top of one another in reverse order, so that when an operation needs to be performed on a variable, it can first look up the variable’s location on the stack and then perform the operation. Stacks have O(1) access time complexity, but can become memory- constrained as entries on the stack grow large.

What is an algorithm?

Algorithms are defined as a step-by-step procedure for solving a problem. They are used in computer programming, mathematics, and other scientific disciplines.

There are many types of algorithms, but the most common are those that solve problems by making decisions. Algorithms can be classified according to how they make decisions: deterministic or probabilistic.

Deterministic algorithms always produce the same result given the same input. Probabilistic algorithms produce different results depending on the input. For example, suppose you’re trying to guess the number of jellybeans in a jar. A deterministic algorithm would simply look at every jellybean and compare it to the number you’re guessing, hoping to find a match. A probabilistic algorithm might instead randomly choose a jellybean from the jar and use that as the input into the algorithm. This way, even if you know nothing about how many jellybeans are in the jar, chances are good that your guess will be close to right.

What are the different types of programming languages?

There are many types of programming languages, some better known than others. The following is a list of the most common ones:

  • C++
  • Java
  • Python
  • PHP
  • Ruby on Rails
  • Objective C

    Each language has its own unique features and benefits, which can make it a better choice for certain tasks. If you want to learn more about different programming languages, check out online resources like code academies or online tutorials.

How do you create a basic program?

If you’re looking to get started in coding, or want to brush up on your skills, these are the top coding interview questions.

Q: What is the difference between a loop and a function?
A: A loop lets you repeat a set of code multiple times, while a function does one task and returns its results.

How do you debug a program?

Most programs that run on computers need to be debugged. Debugging a program is the process of finding and fixing errors in it. There are many different ways to debug a program, and each has its own advantages and disadvantages.

One common way to debug a program is to print out the code as it is running on the computer screen so you can see what is happening. You can also set up a breakpoint in your code so when it hits that point, the program will stop and you can look at the values of variables to see what they are doing.

Another common way to debug a program is to run it under simulation conditions, which makes the computer act like an imaginary user who is making mistakes in your program. Simulation conditions can be created by simulating a network of computers or by running the code on a virtual machine. When a user makes a mistake in your program, simulated users will make mistakes too, and you can use this information to find and fix the real user’s errors.

Yet another common way to debug a program is by using profilers. Profilers collect data about how long it takes for different parts of the program to execute, and this information can help you find problems with your code.

What are some common programming errors?

  1. What are some common programming errors?
  2.  How can you prevent your programs from crashing or failing to run?
  3.  How do you debug your code to find and fix errors?
  4.  What is operator overloading and why should you use it?
  5.  When do you use conditional statements in your code and what conditions should you use them for?
  6.  What are some common problems with arrays and how can you deal with them?
  7.  How do you handle errors when working with strings in your code?
  8.  What are some best practices for handling data structures in your programs?

What is an API and why is it important for developers?

An API, or application programming interface, is a set of rules for communicating with a software program from outside of that program. This allows developers to build tools and applications that interact with other programs without having to learn the ins and outs of those programs themselves. APIs can also be used for data management or for receiving updates or new information from external sources.

API development is important because it opens up potential opportunities for developers who are not familiar with a particular program. It also allows third-party developers to build on top of the features and functionality already available in popular programs. Finally, APIs can help developers manage and track data more effectively.

How do you create a RESTful API?

What makes a RESTful API?

REST stands for Representational State Transfer. The idea behind it is that your API should be able to take any amount of requests and return the data in the same way, regardless of how the data is retrieved. This means that you can use simple GET and POST requests to retrieve data from your API, or you can use more advanced techniques like token-based authentication.

How do you design a RESTful API?

The first step is to come up with an idea for your API. You need to think about what types of data your API will be handling, as well as what kind of requests users will be making. Once you have a clear idea of your goals, you can start designing your API according to those specifications.

There are many different ways to create a RESTful API, but some common methods include:

  •  Using HTTP verbs (GET, POST, PUT, DELETE) and URLs (for example,;
  • Using self-describing JSON objects;
  •  Using Representational State Transfer (REST) principles;
  • Using scaffolding tools like Dustity or Apigee Studio; or
  •  Using a platform like Rails or NodeJS that provides built-in support for APIs.


As a developer, you will likely face interview questions that revolve around coding concepts and how you would go about solving them. This guide provides tips on how to best answer these questions, which will help put your skills in the best light. By following the advice in this article, you’ll be able to confidently tackle any coding interview question thrown your way.