How to Eliminate Duplicates from a Slice, Including the Last Element?

Eliminating Duplicates from a Slice

Maintaining unique elements within a slice is crucial for efficient data manipulation and retrieval. Consider a scenario where you want to remove duplicate peers from a text file using a specific PeerID and Address. While the provided solution appears promising, it encounters an issue when the last peer is a duplicate.

To resolve this, a modified approach that effectively handles duplicate removals, including the last one, is:

<code class="go">i := 0
for _, v := range cfg.Bootstrap {
   if v.PeerId == peer.PeerId &amp;&amp; v.Address == peer.Address {
      continue
   }
   cfg.Bootstrap[i] = v
   i++
}
cfg.Bootstrap = cfg.Bootstrap[:i]</code>

In this revised solution, we introduce an index variable i to keep track of the next empty position in the slice. As we iterate through the slice, if an item matches the duplicate criteria, we simply skip it. Otherwise, we copy the non-duplicate item to the ith position and increment i.

Finally, we truncate the slice to remove any excess elements beyond the last non-duplicate item: cfg.Bootstrap = cfg.Bootstrap[:i]. This approach ensures that all duplicates, even those at the end of the slice, are effectively removed, preserving the integrity of your data without causing any panics.

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