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Bash
Deduplicate Array (preserve order)
Bash's associative arrays let you dedupe in a single pass while keeping the original order — `sort -u` would shuffle.
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Bash
Unique While Preserving Order
`sort -u` re-orders. `awk '!seen[$0]++'` is the classic order-preserving dedupe — and it's a single line.
Python
unique_everseen — Order-Preserving Dedupe
Remove duplicates while preserving original order (set() loses order on collisions). Optional key function lets you dedupe by a derived value — e.g., lowercased email.
PHP
Unique by Callback
Like array_unique, but the uniqueness test is a callback that returns the key to dedupe by. Useful for "unique by ID" or "unique by lowercased email" across arrays of objects/rows.