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hardMachine Coding

Build a Mini Spreadsheet (Excel)

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01

Understand the problem

Build an editable grid with cell selection and basic formulas.

ReactGridFormulas
02

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03

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Building a Mini Spreadsheet in React

Mental model: Store raw cell text in a map keyed by A1-style ids. A cell's displayed value is computed: plain text/number as-is, or — if it starts with = — evaluate the formula by recursively resolving any cell references it contains. Guard against reference cycles w

Solution ready — 2 min read

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04

React solution

Complete solutionRun Playground
import React from 'react';
import Spreadsheet from './src/Spreadsheet';

export default function App() {
  return (
    <div style={{ fontFamily: 'sans-serif', padding: 20 }}>
      <h1>Mini Spreadsheet Demo</h1>
      <p style={{ color: '#666' }}>Click a cell to edit. Try formulas like <code>=A1+B1</code>.</p>
      <Spreadsheet />
    </div>
  );
}
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Transmission complete // awaiting log

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Dossier 74 of 87 decoded in the Frontend Machine Coding track. One more won't hurt.

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