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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