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  1. // 1. Clean each name: trim whitespace, convert to title case ("Alice Chen")
  2. const sanName = (name) => name.split(" ").filter(Boolean).map((w) => w[0].toUpperCase() + w.slice(1).toLowerCase()).join(" ");
  3.  
  4. // 2. Remove duplicates (case-insensitive comparison)
  5. const dedupNames = (names) => {
  6.     const seen = new Set();
  7.     return names.filter((n) => {
  8.         const key = n.toLowerCase();
  9.         if (seen.has(key)) return false;
  10.         seen.add(key);
  11.         return true;
  12.     });
  13. };
  14.  
  15. // 3. Sort alphabetically
  16. const sortName = (names) => [...names].sort((a, b) => a.localeCompare(b));
  17.  
  18. // +extra
  19. const flagDups = (names) => {
  20.     const counts = {};
  21.     names.forEach((n) => (counts[n] = (counts[n] || 0) + 1));
  22.     return Object.keys(counts).filter((n) => counts[n] > 1);
  23. };
  24.  
  25. // test
  26. const rawNames = [
  27.     "  alice Chen", "BOB martinez ", "alice chen",
  28.     " Carlos ruiz", "Diana WONG", "bob Martinez",
  29.     "  eva Kim ", "Carlos Ruiz"
  30. ];
  31.  
  32. console.assert(
  33.     JSON.stringify(rawNames.map(sanName)) === JSON.stringify(["Alice Chen", "Bob Martinez", "Alice Chen", "Carlos Ruiz", "Diana Wong", "Bob Martinez", "Eva Kim", "Carlos Ruiz"]),
  34.     "sanName failed"
  35. );
  36.  
  37. const result = sortName(dedupNames(rawNames.map(sanName)));
  38.  
  39. console.assert(
  40.     JSON.stringify(result) === JSON.stringify(["Alice Chen", "Bob Martinez", "Carlos Ruiz", "Diana Wong", "Eva Kim"]),
  41.     "dedup/sort failed", result
  42. );
  43.  
  44. console.assert(
  45.     JSON.stringify(flagDups(rawNames.map(sanName))) === JSON.stringify(["Alice Chen", "Bob Martinez", "Carlos Ruiz"]),
  46.     "flagDups failed"
  47. );
  48.  
  49.  
Success #stdin #stdout 0.04s 42488KB
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https://ideone.com/apvVGo
language:
Node.js (node 20.14)
created:
1 day ago
visibility:
public

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