About
Stay fluent. Five minutes a day.
Etuder is a daily coding etude: one short pattern drill so working developers do not rust.
What it is
Each day there is one etude. Five to ten minutes. One pattern — a hashmap, two pointers, a sliding window. You write the function, run the tests, and stop. Tomorrow there is another.
Who it is for
People who already ship code at work and do not have an afternoon for a problem set. The skill fades when you only glue frameworks. A short drill keeps the patterns in your hands.
How it works
Today’s etude is free. Log in to run tests and submit. Pro opens the catalog so you can work through as many as you want, and adds Rust, Java, and Swift.
Languages
Python, TypeScript, and Go on the free plan. Rust, Java, and Swift on Pro.
What it is not
Not a course. Not two thousand interview questions. Not a leaderboard. One etude a day is the point.