O(1)O(n)O(log n)O(n²)useMemoSet<T>async/awaitBig O
The gym,
for your
engineering brain.
Ten minutes, one commute. A steady drip of Big O, JavaScript, React, Next.js, React Native, CSS, and SEO — delivered the way a senior would grill you in a screen.
You knew all this once.
You'll know it again by Friday.
Three formats
Tap-to-answer. Tap-to-reveal. Tap-to-explain.
Quick multiple-choice for the reflex stuff. Short-form written prompts for when you need to actually articulate it. And an “explain back to me” mode that reveals the canonical answer once you've written yours.
Every question comes with a tutor walk-through — why the right answer is right, and where the popular wrong one goes off the rails.
Mastered
See exactly where you're sharp. And where you're not.
Every correct answer moves you up a mastery tier. Every miss drops you back a rung and gets recycled into tomorrow's set. The dashboard is blunt about your weak spots because that's the whole point.
Topics
What you'll keep sharp.
AlgorithmsBig OData StructuresJavaScriptTypeScriptReactNext.jsReact NativeCSSNetworkingSEOSystem Design