Premium

React Dynamic Table (Rows × Columns)

By FrontendAtlas Team · Updated Jan 30, 2026

Generate a dynamic table in React from row/column inputs. Normalize values, rebuild the grid on action, and render consistent labels so users can verify correct dimensions. Concepts: react, state, event-handlers. React focus: generate rows/cols with map and keep inputs controlled. Framework focus: React hooks (useState/useEffect),…

Render a main UI that contains the dynamic table controls.
Provide two numeric inputs: one for the number of rows and one…

What you’ll build / What this tests

This premium react coding focuses on React Dynamic Table (Rows × Columns). You’ll apply react and state thinking with easy level constraints. The prompt emphasizes Generate a dynamic table in React from row/column inputs. Normalize values, rebuild the grid on action,….

Learning goals

Translate the prompt into a clear react API signature and return shape.
Apply react, state, event-handlers techniques to implement react dynamic table (rows × columns).
Handle easy edge cases without sacrificing readability.
Reason about time/space complexity and trade-offs in react.

Key decisions to discuss

Define the exact input/output contract before coding.
Choose iteration vs higher-order methods for readability.
Prioritize predictable edge-case handling over micro-optimizations.

Evaluation rubric

Correctness: covers required behaviors and edge cases.
Clarity: readable structure and predictable control flow.
Complexity: avoids unnecessary work for large inputs.
API discipline: no mutation of inputs; returns expected shape.
Testability: solution is easy to unit test.

Constraints / Requirements

Render a main UI that contains the dynamic table controls.
Provide two numeric inputs: one for the number of rows and one for the number of columns.
Provide a button (e.g. "Generate table") that rebuilds the table when clicked.
Render an HTML table whose number of rows and columns matches the current inputs.
Each cell should show something simple and visible, e.g. its row/column indices like R1C1.
Initially, showing an empty state or no table is fine. After the first generate action, a table appears.
Changing the row or column input and clicking the button updates the table dimensions.
If the user enters non-positive values (0 or negative), the implementation may either render no rows/columns or clamp…
Use React state (useState) to store the current numeric inputs (rows, columns) and the arrays driving the table.
Keep separate state for the raw inputs and the derived arrays you map over (e.g. rows and cols).

Mini snippet (usage only)

// Example usage
const input = /* react dynamic table (rows × columns) input */;
const result = solve(input);
console.log(result);

// Edge case check
const empty = input ?? null;
const fallback = solve(input);
console.log(fallback);

// Expected: describe output shape, not the implementation
// (no solution code in preview)

Common pitfalls

Mutating inputs instead of returning a new value.
Skipping edge cases like empty input, duplicates, or nulls.
Overlooking time complexity for large inputs.