| ### 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. |
