유니온 & 인터섹션 타입 해부

// type Result = Success | Failure (유니온)
  function processResult(result) {
    if ('data' in result) {
      return `[SUCCESS] 데이터: ${result.data}`;
    } else {
      return `[FAILURE] 오류: ${result.error}`;
    }
  }

  // type FullUnit = Base & Extended (인터섹션)
  const createFullUnit = (base, ext) => ({ ...base, ...ext });

  const results = [
    processResult({ data: 'T-800 온라인', status: 200 }),
    processResult({ error: '연결 실패', code: 404 }),
  ];

  const fullUnit = createFullUnit({ model: 'T-800', threat: 8 }, { location: 'LA', active: true });

  results.forEach(r => {
    const el = document.createElement('div');
    el.style.color = r.includes('SUCCESS') ? '#22c55e' : '#10b981';
    el.style.fontSize = '11px'; el.style.marginBottom = '4px';
    el.textContent = r;
    document.currentScript.parentElement.appendChild(el);
  });

  const el = document.createElement('div');
  el.style.color = '#f59e0b'; el.style.fontSize = '11px'; el.style.marginTop = '8px';
  el.textContent = '[INTERSECTION] ' + JSON.stringify(fullUnit);
  document.currentScript.parentElement.appendChild(el);