Reasoning
How clearly you frame the problem and choose a workable approach.
Zed
Practice the thinking,
not the answer.
Build patterns, explain tradeoffs, test edge cases, and ask for the smallest useful hint.
Practice with Zed solution.ts
function traverse(grid) {
// visit each node once
const seen = new Set();
}
Zed recommends
Graph traversal
62% mastery
Interactive preview
Test the approach, then explain it.
Two Sum · Warm-up
JavaScript01 function twoSum(nums, target) {
02 const seen = new Map();
03 for (let i = 0; i < nums.length; i++) {
04 const needed = target - nums[i];
05 if (seen.has(needed)) return [seen.get(needed), i];
06 seen.set(nums[i], i);
07 }
08 }
Zed
Your coding coach
Explain why the map lookup keeps this solution linear.
What Zed observes
Testing
Whether you find edge cases, verify assumptions, and read failures.
Communication
How well you explain complexity, alternatives, and tradeoffs.