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eQuiz
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Jscrambler
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Code Arcade
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hackattic
Daily Coding Problem
Frontloops
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Based on our record, Code Arcade seems to be more popular. It has been mentiond 4 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
You can practice your code solving skills here: Https://app.codesignal.com/arcade Https://leetcode.com/problemset/all/. Source: about 3 years ago
CodeSignal's Arcade (signup required) has a lot of practice problems at different levels that can help break you out of the mindset of copying tutorial code. Source: over 4 years ago
I like the Databases section of CodeSignal Arcade. Problems increase in difficulty, plus I've found it's the platform a lot of companies use for SQL assessment so you'll get a good sense of the type of questions to expect. Source: over 4 years ago
Codesignal has a good set of SQL questions. Not sure they "support" Postgres, but there's 84 free levels under the Arcade section. https://app.codesignal.com/arcade. Source: over 4 years ago
eQuiz - Play against the computer, your friends and others in a fun and free trivia challenge.
CodinGame - CodinGame provides users with a fun and effective way to learn coding that eschews the rigid structure of traditional teaching methods.
QuizUp - QuizUp gives you the opportunity to test your trivia skills against friends and strangers throughout the world.
hackattic - No nonsense, real world programming challenges
Trivia Crack - Produced by Etermax, Trivia Crack lets players answer trivia questions and compete against other people on mobile devices.
Daily Coding Problem - Get exceptionally good at coding interviews