Itertools

Extra iterator adaptors, functions and macros. Requires Rust 1.11 or later.

Please read the API documentation here__

__ https://bluss.github.io/rust-itertools/

|buildstatus| |crates|_

.. |buildstatus| image:: https://travis-ci.org/bluss/rust-itertools.svg?branch=master .. _buildstatus: https://travis-ci.org/bluss/rust-itertools

.. |crates| image:: http://meritbadge.herokuapp.com/itertools .. _crates: https://crates.io/crates/itertools

How to use with cargo::

[dependencies]
itertools = "0.4"

How to use in your crate:

.. code:: rust

#[macro_use] extern crate itertools;

use itertools::Itertools;

How to contribute:

• Fix a bug or implement a new thing
• Include tests for your new feature, preferably a quickcheck test
• Make a Pull Request

Recent Changes

• 0.5.0-alpha.0, 0.5.0-alpha.1

  • Prereleases

  • Renamed:

  • combinations is now tuple_combinations

  • combinations_n to combinations
  • groupbylazy, chunkslazy to groupby, chunks
  • Unfold::new to unfold()
  • RepeatCall::new to repeat_call()
  • Zip::new to multizip
  • PutBack::new, PutBackN::new to putback, putback_n
  • PutBack::with_value is now a builder setter, not a constructor
  • MultiPeek::new, .multipeek() to multipeek()
  • format to formatwith and formatdefault to format
  • .into_rc() to rciter

  • Partition enum is now Either

  • Module reorganization:

  • All iterator structs are under itertools::structs but also reexported to the top level, for backwards compatibility

  • All free functions are reexported at the root, itertools::free will be removed in the next version

  • Removed:

  • ZipSlices, use .zip() instead

  • .enumerate_from(), ZipTrusted, due to being unstable
  • .mend_slices(), moved to crate odds
  • Stride, StrideMut, moved to crate odds
  • linspace(), moved to crate itertools-num
  • .sortby(), use .sortedby()
  • .isemptyhint(), use .size_hint()
  • .dropn(), use .dropping()
  • .map_fn(), use .map()
  • .slice(), use .take() / .skip()
  • helper traits in misc
  • new constructors on iterator structs, use Itertools trait or free functions instead

  • itertools::size_hint is now private

  • Behaviour changes:

  • format and format_with helpers now panic if you try to format them more than once.

  • repeat_call is not double ended anymore

  • New features:

  • tuple flattening iterator is constructible with cons_tuples

  • itertools reexports Either from the either crate. Either<L, R> is an iterator when L, R are.
  • MinMaxResult now implements Copy and Clone
  • tuple_combinations supports 1-4 tuples of combinations (previously just 2)

• 0.4.19

  • Add .minmax_by()
  • Add itertools::free::cloned
  • Add itertools::free::rciter
  • Improve .step(n) slightly to take advantage of specialized Fuse better.

• 0.4.18

  • Only changes related to the "unstable" crate feature. This feature is more or less deprecated.

  • Use deprecated warnings when unstable is enabled. .enumerate_from() will be removed imminently since it's using a deprecated libstd trait.

• 0.4.17

  • Fix bug in .kmerge() that caused it to often produce the wrong order (#134)

• 0.4.16

  • Improve precision of the interleave_shortest adaptor's size hint (it is now computed exactly when possible).

• 0.4.15

  • Fixup on top of the workaround in 0.4.14. A function in itertools::free was removed by mistake and now it is added back again.

• 0.4.14

  • Workaround an upstream regression in a rust nightly build that broke compilation of of itertools::free::{interleave, merge}

• 0.4.13

  • Add .minmax() and .minmaxbykey(), iterator methods for finding both minimum and maximum in one scan.
  • Add .format_default(), a simpler version of .format() (lazy formatting for iterators).

• 0.4.12

  • Add .zip_eq(), an adaptor like .zip() except it ensures iterators of inequal length don't pass silently (instead it panics).
  • Add .fold_while(), an iterator method that is a fold that can short-circuit.
  • Add .partition_map(), an iterator method that can separate elements into two collections.

• 0.4.11

  • Add .get() for Stride{,Mut} and .get_mut() for StrideMut

• 0.4.10

  • Improve performance of .kmerge()

• 0.4.9

  • Add k-ary merge adaptor .kmerge()
  • Fix a bug in .islice() with ranges a..b where a > b.

• 0.4.8

  • Implement Clone, Debug for Linspace

• 0.4.7

  • Add function diff_with() that compares two iterators
  • Add .combinations_n(), an n-ary combinations iterator
  • Add methods PutBack::withvalue and PutBack::intoparts.

• 0.4.6

  • Add method .sorted()
  • Add module itertools::free with free function variants of common iterator adaptors and methods. For example enumerate(iterable), rev(iterable), and so on.

• 0.4.5

  • Add .flatten()

• 0.4.4

  • Allow composing ZipSlices with itself

• 0.4.3

  • Write iproduct!() as a single expression; this allows temporary values in its arguments.

• 0.4.2

  • Add .fold_options()
  • Require Rust 1.1 or later

• 0.4.1

  • Update .dropping() to take advantage of .nth()

• 0.4.0

  • .merge(), .unique() and .dedup() now perform better due to not using function pointers
  • Add free functions enumerate() and rev()

  • Breaking changes:

  • Return types of .merge() and .merge_by() renamed and changed

  • Method Merge::new removed
  • .merge_by() now takes a closure that returns bool.
  • Return type of .dedup() changed
  • Return type of .mend_slices() changed
  • Return type of .unique() changed
  • Removed function times(), struct Times: use a range instead
  • Removed deprecated macro icompr!()
  • Removed deprecated FnMap and method .fnmap(): use .mapfn()
  • .interleave_shortest() is no longer guaranteed to act like fused

• 0.3.25

  • Rename .sortby() to .sortedby(). Old name is deprecated.
  • Fix well-formedness warnings from RFC 1214, no user visible impact

• 0.3.24

  • Improve performance of .merge()'s ordering function slightly

• 0.3.23

  • Added .chunks(), similar to (and based on) .groupbylazy().
  • Tweak linspace to match numpy.linspace and make it double ended.

• 0.3.22

  • Added ZipSlices, a fast zip for slices

• 0.3.21

  • Remove Debug impl for Format, it will have different use later

• 0.3.20

  • Optimize .groupbylazy()

• 0.3.19

  • Added .groupbylazy(), a possibly nonallocating group by
  • Added .format(), a nonallocating formatting helper for iterators
  • Remove uses of RandomAccessIterator since it has been deprecated in rust.

• 0.3.17

  • Added (adopted) Unfold from rust

• 0.3.16

  • Added adaptors .unique(), .unique_by()

• 0.3.15

  • Added method .sort_by()

• 0.3.14

  • Added adaptor .while_some()

• 0.3.13

  • Added adaptor .interleave_shortest()
  • Added adaptor .pad_using()

• 0.3.11

  • Added assert_equal function

• 0.3.10

  • Bugfix .combinations() size_hint.

• 0.3.8

  • Added source RepeatCall

• 0.3.7

  • Added adaptor PutBackN
  • Added adaptor .combinations()

• 0.3.6

  • Added itertools::partition, partition a sequence in place based on a predicate.
  • Deprecate icompr!() with no replacement.

• 0.3.5

  • .mapfn() replaces deprecated .fnmap().

• 0.3.4

  • .takewhileref() by-ref adaptor
  • .coalesce() adaptor
  • .mend_slices() adaptor

• 0.3.3

  • .dropping_back() method
  • .fold1() method
  • .isemptyhint() method

License

Dual-licensed to be compatible with the Rust project.

Licensed under the Apache License, Version 2.0 http://www.apache.org/licenses/LICENSE-2.0 or the MIT license http://opensource.org/licenses/MIT, at your option. This file may not be copied, modified, or distributed except according to those terms.