Empowering everyone to build reliable and efficient software.
⑂ 15k◎ 13k
Crate
itertools
Extra iterator adaptors, methods, and free functions for Rust.
What it is
itertools extends Rust's standard Iterator with additional combinators: chunked, windowed, sorted, grouped, zipped, product, permutations, combinations, deduplication, and more. All methods are zero-cost lazy adaptors following the same pattern as std::iter.
Why it is commonly used
Used when the standard Iterator trait lacks a needed combinator. Common in data processing, graph algorithms, combinatorics, and functional-style Rust code that chains complex iterator pipelines.
955
Repositories
91%
Actively maintained
861
Updated ≤ 30 days
3.8M
Total stars
794
Owners
Counted from the Cargo.toml manifests of the 955 indexed repositories that declare itertools as a dependency — not download counts. Dependency data last verified 2026-08-13.
Often used with
Crates that show up unusually often in itertools projects. The most distinctive pairings rank first — crates these projects use far more than the average indexed Rust project does, not just crates that are popular everywhere. Each percentage is the share of itertools projects that also use it.
indoc12.8%pretty_assertions16.1%derive_more20.7%num-bigint13.6%serde_with22.8%either13.6%rstest12%insta14.2%strum_macros16.3%rand_chacha10.5%petgraph10.2%strum37.2%paste18.8%tikv-jemallocator13%num-traits25.7%pin-project10.1%nom10.8%proptest13.9%humantime13.3%indexmap36.4%hashbrown13.8%csv15.7%byteorder15.6%cfg-if14.9%
Used by these organizations
CloudflareMozillaAWSMicrosoftGoogleOxide ComputerParity TechnologiesDenoZed IndustriesFly.ioTursoPingCAPVercelThe Rust ProjectFuel LabsAstralTauriOpenAIUnionWarpMeilisearchRerunTokioBevy EngineBytecode AllianceLinebenderNushellQdrantQuickwitDatadogEmbassygfx-rsprobe-rsPyO3IcedRatatuiuutilsLeptosWasmerTracel AIrustlsServoParadigmMatrix.org
50 of 955 repositories · ranked by stars · 861 pushed in the last 30 days
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