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### Iterators
The new [`iter` package](/pkg/iter/) provides the basic definitions for
working with user-defined iterators.
The [`slices` package](/pkg/slices/) adds several functions that work
with iterators:
- [All](/pkg/slices#All) returns an iterator over slice indexes and values.
- [Values](/pkg/slices#Values) returns an iterator over slice elements.
- [Backward](/pkg/slices#Backward) returns an iterator that loops over
a slice backward.
- [Collect](/pkg/slices#Collect) collects values from an iterator into
a new slice.
- [AppendSeq](/pkg/slices#AppendSeq) appends values from an iterator to
an existing slice.
- [Sorted](/pkg/slices#Sorted) collects values from an iterator into a
new slice, and then sorts the slice.
- [SortedFunc](/pkg/slices#SortedFunc) is like `Sorted` but with a
comparison function.
- [SortedStableFunc](/pkg/slices#SortedStableFunc) is like `SortFunc`
but uses a stable sort algorithm.
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