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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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Python
argparse with Subcommands
Standard-library CLI framework. Subcommands (like `git COMMAND`) require a sub-parser per command, each with its own arguments and handler.
Go
maps package — Modern Helpers
`maps` (Go 1.21+) adds Keys, Values, Equal, Clone, Copy — replaces the slice-of-keys boilerplate you used to write to iterate a map deterministically.