diff options
Diffstat (limited to 'doc/tutorial-container.md')
| -rw-r--r-- | doc/tutorial-container.md | 28 |
1 files changed, 22 insertions, 6 deletions
diff --git a/doc/tutorial-container.md b/doc/tutorial-container.md index 2146b76a4af..ada55de805f 100644 --- a/doc/tutorial-container.md +++ b/doc/tutorial-container.md @@ -192,7 +192,7 @@ let mut it = xs.iter().zip(ys.iter()); // print out the pairs of elements up to (&3, &"baz") for it.advance |(x, y)| { - println(fmt!("%d %s", *x, *y)); + printfln!("%d %s", *x, *y); if *x == 3 { break; @@ -200,7 +200,7 @@ for it.advance |(x, y)| { } // yield and print the last pair from the iterator -println(fmt!("last: %?", it.next())); +printfln!("last: %?", it.next()); // the iterator is now fully consumed assert!(it.next().is_none()); @@ -294,15 +294,31 @@ another `DoubleEndedIterator` with `next` and `next_back` exchanged. ~~~ let xs = [1, 2, 3, 4, 5, 6]; let mut it = xs.iter(); -println(fmt!("%?", it.next())); // prints `Some(&1)` -println(fmt!("%?", it.next())); // prints `Some(&2)` -println(fmt!("%?", it.next_back())); // prints `Some(&6)` +printfln!("%?", it.next()); // prints `Some(&1)` +printfln!("%?", it.next()); // prints `Some(&2)` +printfln!("%?", it.next_back()); // prints `Some(&6)` // prints `5`, `4` and `3` for it.invert().advance |&x| { - println(fmt!("%?", x)) + printfln!("%?", x) } ~~~ The `rev_iter` and `mut_rev_iter` methods on vectors just return an inverted version of the standard immutable and mutable vector iterators. + +The `chain_`, `transform`, `filter`, `filter_map` and `peek` adaptors are +`DoubleEndedIterator` implementations if the underlying iterators are. + +~~~ +let xs = [1, 2, 3, 4]; +let ys = [5, 6, 7, 8]; +let mut it = xs.iter().chain_(ys.iter()).transform(|&x| x * 2); + +printfln!("%?", it.next()); // prints `Some(2)` + +// prints `16`, `14`, `12`, `10`, `8`, `6`, `4` +for it.invert().advance |x| { + printfln!("%?", x); +} +~~~ |