Hash Tables & JavaScript Objects

What optimization is missing from this delete implementation?

class HashTable {
  delete(key) {
    const index = this._hash(key);
    if (!this.keyMap[index]) return false;
    const bucket = this.keyMap[index];
    const keyIndex = bucket.findIndex(item => item[0] === key);
    if (keyIndex === -1) return false;
    bucket.splice(keyIndex, 1);
    return true;
  }
}

Error handling
Key validation
Bucket cleanup
The implementation should include bucket cleanup: 1) Remove empty bucket array after last item deleted, 2) Reduces memory usage, 3) Improves iteration performance, 4) Maintains clean internal structure, 5) Helps with load factor calculations, 6) Prevents empty bucket accumulation, 7) Important for long-running hash tables, 8) Common optimization in production implementations.
Hash recalculation

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