Iterators practice problems in Rust

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Title	Difficulty	Category
any, all, find, position: audit a list of records	Easy	Primitives
Bounds checks: when they cost, and five safe ways to remove them	Hard	End-to-End
Chains versus loops: top-k, and a function that must not allocate	Medium	End-to-End
Closures 101: build a pipeline of boxed closures	Easy	Primitives
collect and the turbofish: three targets, one source	Medium	Primitives
Collecting an iterator of Results	Medium	Primitives
Everything you can collect into	Easy	Primitives
flat_map: expand a range spec like "1-3,7,10-12"	Medium	End-to-End
fold and try_fold: a total that refuses to overflow	Medium	Primitives
from_fn and successors: iterators without writing a struct	Easy	Primitives
Implement Iterator by hand: the Collatz sequence	Medium	Primitives
Indexing in a loop is usually a borrow-checker workaround — and clippy knows	Medium	Primitives
IntoIterator: one bound that accepts five containers	Medium	Primitives
Iterator invalidation, and the bug class that stopped existing	Medium	Primitives
Iterator performance: where the abstraction leaks	Medium	End-to-End
iter, iter_mut, into_iter: all three, one Vec	Easy	Primitives
iter_mut(): mutating every element without ever holding two &mut	Medium	Primitives
Joining owned strings	Easy	Primitives
Laziness: prove the pipeline interleaves	Easy	Primitives
`longest`: writing your first `'a`	Medium	Primitives
loop, while, for, and break with a value	Easy	Primitives
Make the lint happy: `'_` in return paths	Easy	Primitives
Make your own collection iterable, all three ways	Hard	Framework
map, filter, filter_map: parse host:port lines	Easy	Primitives
min and max: the tie-breaking rule nobody reads	Medium	Primitives
Ownership inside loops	Medium	Primitives
partition and unzip: two collections from one pass	Medium	Primitives
peekable and next_if: write a tokeniser	Hard	End-to-End
`PhantomData`, variance and drop-check	Hard	Framework
scan: a running balance that stops at the floor	Medium	Primitives
Set algebra with BTreeSet	Easy	Primitives
size_hint and DoubleEndedIterator: an iterator with two ends	Hard	Primitives
take_while and skip_while: split a message at the blank line	Easy	Primitives
The double-reference wall: &&x, copied and cloned	Medium	Primitives
The FnMut borrow gauntlet: a log you can read afterwards	Medium	Primitives
The Option combinator vocabulary	Easy	Primitives
Vec surgery: retain, dedup and extract_if	Medium	Primitives
windows and chunks are slice methods, not iterator adapters	Medium	Primitives
Write your own adapters, with an extension trait	Hard	Framework
zip and enumerate: pair two lists and report the leftovers	Easy	Primitives