⌁ 30 Days of DSA — JS
Free · No sign-up · Works fully offline

30 Days of DSA in JavaScript

From dummy to dummies.

Interview Ready — a free, self-paced course. Every lesson has a diagram, an interactive animation you control, a line-by-line dry run, real interview questions, practice problems, and a quiz. Plain English, no fluff.

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The 30-Day Roadmap

How to use this course

  1. Read the goal and concept for the day.
  2. Watch the animation — press Step to go one move at a time, or Play to run it. The narration line tells you exactly what's happening in plain English.
  3. Code along — read the commented code and the line-by-line explanation.
  4. Solve the 3 practice problems yourself before peeking at hints or solutions.
  5. Quiz yourself with the 5 quick questions, then mark the day complete.