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Go
slices package — Modern Helpers
`slices` (Go 1.21+) ships the iteration helpers everyone wrote by hand for years: Contains, Index, Sort, SortFunc, BinarySearch, Clone, Reverse, Equal, Max/Min.
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Rust
Slice Pattern: Borrow Without Copy
A slice (`&[T]`) is a borrowed view into a contiguous sequence. Pass `&v[..]` or just `&v` instead of `v.clone()` when the function only needs to read.