Categories Roadmaps Plans Resources

Categories Roadmaps Plans Resources

InterviewLane

The frontend interview prep platform built by engineers, for engineers.

PracticeCategories Random round Daily challenge

RoadmapsAll roadmaps Frontend foundations Senior frontend

Plans7-day refresher 30-day deep prep 90-day mastery

AccountDashboard Bookmarks Sign in

© 2026 InterviewLane

Terms PrivacyBuilt for senior frontend engineers

7-Day Refresher · InterviewLane

7-day plan

7-Day Refresher

Hits the highest-frequency interview surfaces — React, JavaScript, performance, and system design — in a tight daily rotation. Perfect when you have little time and need maximum signal.

Day 1

0/4 done

Implement a polyfill for Object.assignfrontend · easy
How would you design a reusable table component with features like sorting, filtering, pagination, and column resizingfrontend · hard
Build a Clean component logicreact · easy
Search bar with debounce + async suggestions — how do you architect itjavascript · medium

Day 2

0/4 done

Reconciliation and the Virtual DOM — how does React decide what to update?react · medium
Functional vs class components in Reactreact · easy
Design a user authentication flow with social login (OAuth, JWT tokens).frontend · hard
Word Break II — string segmentation using a dictionaryfrontend · easy

Day 3

0/4 done

How do you send multiple API requests on a single button clickjavascript · medium
Why does the viewport meta tag matter for mobile UIfrontend · medium
When function declarations vs arrow functions impact performanceperformance · medium
Would you use any libraries or build your own virtual scroll logicfrontend · easy

Day 4

0/4 done

Explain React's Strict Mode and its impact on development.react · medium
How would you build a notification system (toasts/alerts) with queuing and auto-dismiss behavior in Reactreact · medium
Why migrate from Angular to React? What challenges did you facereact · medium
Explain event loop and how asynchronous tasks are executed in JavaScript.browser-internals · medium

Day 5

0/4 done

How do you ensure consistent rendering and layout across browsers and devices?css · medium
Repaint vs reflow and avoiding layout thrashingcss · easy
What is closure? Where have you used itjavascript · easy
Difference between AI and Generative AIfrontend · easy

Day 6

0/4 done

How do you reduce bundle size in production?performance · medium
Explain the useEffect hook lifecyclereact · medium
== vs === — what does coercion actually do?javascript · easy
Frontend system design: design a Poll widgetfrontend · hard

Day 7

0/4 done

Implement a polyfill for useImperativeHandlefrontend · easy
Walk me through your role designing a frontend architecturesystem-design · hard
How would you implement infinite scrolling in React?react · medium
What is the value of `this` in different contexts?javascript · easy