Sign in
Skip to solution
mediumMachine Coding

Build a Custom Multi-select Dropdown

425 views
01

Understand the problem

Build a multi-select dropdown with search and chips.

ReactDropdownAccessibility
02

Attempt it yourself

Sketch your approach before reading the solution — that's what interviews test.

Nudge consolestandby

Stuck? Beam a request up — the console returns a conceptual nudge that guides your logic without spoiling the implementation.

03

Study the solution

Solve in

Building a Multi-select Dropdown in React

Mental model: A multi-select is a toggleable panel of checkable options where the selection is a Set of values. The trigger summarizes the selection ("2 selected"); the panel toggles membership. Close on outside-click. Keep it controlled — parent owns the selected arr

Solution ready — 2 min read

Classified // press E to declassify

04

React solution

Complete solutionRun Playground
import React, { useState } from 'react';
import MultiSelect from './src/MultiSelect';

const OPTIONS = [
  { value: 'js', label: 'JavaScript' },
  { value: 'ts', label: 'TypeScript' },
  { value: 'py', label: 'Python' },
  { value: 'go', label: 'Go' },
  { value: 'rs', label: 'Rust' },
];

export default function App() {
  const [selected, setSelected] = useState(['ts']);
  return (
    <div style={{ fontFamily: 'sans-serif', padding: 20 }}>
      <h1>Multi-select Demo</h1>
      <MultiSelect options={OPTIONS} value={selected} onChange={setSelected} />
      <p style={{ color: '#666' }}>Selected: {selected.join(', ') || '(none)'}</p>
    </div>
  );
}
05

Join the discussion

Discussion (0)

Sign in to join the discussion.

No responses yet. Be the first to share what you think.

Transmission complete // awaiting log

KEEP THE
STREAK ALIVE.

Dossier 45 of 87 decoded in the Frontend Machine Coding track. One more won't hurt.

Back to track