When looking for a good coding test, the first and only thing you should consider is whether it will give you the information you need. Even the most outrageously expensive cutting test platforms will still save you money if it does. Here are some quintessential Coding platforms you shouldn’t miss out.
TopCoder is one of the original, competitive online programming platforms. It offers a compilation of past algorithmic tasks that you can use their code editor to complete on your own, directly online. Their famous single-round matches are provided at a specific time a few times a month, where you compete against others to solve the fastest challenges with the best score.
Coderbyte provides 200 + coding challenges that you can solve online directly in one of 10 programming languages (see this example). The challenges range from easy (finding the largest word in a string) to hard (printing the maximum matching cardinality of a graph). This coding test platform also provides a collection of algorithm tutorials, introductory videos, and preparation courses for interviews. Like HackerRank and other similar websites, aside from the official solutions posted by Coderbyte, you can access the solutions other users bring to any problem.
Project Euler offers a wide range of computer science and mathematics challenges. Typically, the challenges involve writing a small program to identify the solution to a clever mathematical formula or equation, such as finding the sum of numbers of all numbers that precede each number in a series. In an editor, you cannot code directly on the website, so you’d have to write a solution on your own computer and then provide the solution on their website.
HackerRank poses challenges for a number of different domains, such as Algorithms, Math, SQL, Functional Programming, AI, and more. All the challenges can be solved directly online (check out this example). They bless you with a discussion and leaderboard for each challenge, and most challenges come along with an editorial that explains in brief the challenge in more detail and how to approach it to find a solution. HackerRank also provides users with pre-employment testing softwares and apply for jobs through the resolution of company-sponsored coding challenges.
CodeChef is a competitive programming website based in India which poses hundreds of challenges. In their online editor, you can write code and view a collection of challenges that are separated into different categories depending on your skill level (see this example). They have a large community of coders that contribute to the forums, write tutorials, and participate in the coding competitions at CodeChef.