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mediumMachine Coding

Build a Transfer List

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01

Understand the problem

Build a dual-list picker that moves items between two columns.

ReactListsSelection
02

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03

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Building a Transfer List in React

Mental model: Two lists (left/right) plus a selection set of items the user has ticked. Move buttons shift selected items between sides. Model the two columns as arrays and the ticks as a Set; moving is array filter + concat, then clear the moved ticks.

Step 1 — Two ar

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04

React solution

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

const items = [
  { id: 1, label: 'HTML' },
  { id: 2, label: 'CSS' },
  { id: 3, label: 'JavaScript' },
  { id: 4, label: 'TypeScript' },
  { id: 5, label: 'React' },
  { id: 6, label: 'Node' },
];

export default function App() {
  return (
    <div style={{ fontFamily: 'sans-serif', padding: 20 }}>
      <h1>Transfer List Demo</h1>
      <TransferList initialLeft={items} initialRight={[]} />
    </div>
  );
}
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