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<!DOCTYPE html> < html lang = "en" > < head > < meta charset = "utf-8" > < meta name = "viewport" content = "width=device-width, initial-scale=1.0" > < meta name = "generator" content = "rustdoc" > < meta name = "description" content = "Perform a fold operation over the iterable." > < title > fold in itertools - Rust< / title > < script > if ( window . location . protocol !== "file:" ) document . head . insertAdjacentHTML ( "beforeend" , "SourceSerif4-Regular-46f98efaafac5295.ttf.woff2,FiraSans-Regular-018c141bf0843ffd.woff2,FiraSans-Medium-8f9a781e4970d388.woff2,SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2,SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2" . split ( "," ) . map ( f => ` <link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/ ${ f } "> ` ) . join ( "" ) ) < / script > < link rel = "stylesheet" href = "../static.files/normalize-76eba96aa4d2e634.css" > < link rel = "stylesheet" href = "../static.files/rustdoc-dd39b87e5fcfba68.css" > < meta name = "rustdoc-vars" data-root-path = "../" data-static-root-path = "../static.files/" data-current-crate = "itertools" data-themes = "" data-resource-suffix = "" data-rustdoc-version = "1.80.0 (051478957 2024-07-21)" data-channel = "1.80.0" data-search-js = "search-d52510db62a78183.js" data-settings-js = "settings-4313503d2e1961c2.js" > < script src = "../static.files/storage-118b08c4c78b968e.js" > < / script > < script defer src = "sidebar-items.js" > < / script > < script defer src = "../static.files/main-20a3ad099b048cf2.js" > < / script > < noscript > < link rel = "stylesheet" href = "../static.files/noscript-df360f571f6edeae.css" > < / noscript > < link rel = "alternate icon" type = "image/png" href = "../static.files/favicon-32x32-422f7d1d52889060.png" > < link rel = "icon" type = "image/svg+xml" href = "../static.files/favicon-2c020d218678b618.svg" > < / head > < body class = "rustdoc fn" > <!-- [if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif] --> < nav class = "mobile-topbar" > < button class = "sidebar-menu-toggle" title = "show sidebar" > < / button > < / nav > < nav class = "sidebar" > < div class = "sidebar-crate" > < h2 > < a href = "../itertools/index.html" > itertools< / a > < span class = "version" > 0.13.0< / span > < / h2 > < / div > < div class = "sidebar-elems" > < / div > < / nav > < div class = "sidebar-resizer" > < / div > < main > < div class = "width-limiter" > < rustdoc-search > < / rustdoc-search > < section id = "main-content" class = "content" > < div class = "main-heading" > < h1 > Function < a href = "index.html" > itertools< / a > ::< wbr > < a class = "fn" href = "#" > fold< / a > < button id = "copy-path" title = "Copy item path to clipboard" > Copy item path< / button > < / h1 > < span class = "out-of-band" > < a class = "src" href = "../src/itertools/free.rs.html#186-192" > source< / a > · < button id = "toggle-all-docs" title = "collapse all docs" > [< span > − < / span > ]< / button > < / span > < / div > < pre class = "rust item-decl" > < code > pub fn fold< I, B, F> (iterable: I, init: B, f: F) -> B< div class = "where" > where
I: < a class = "trait" href = "https://doc.rust-lang.org/1.80.0/core/iter/traits/collect/trait.IntoIterator.html" title = "trait core::iter::traits::collect::IntoIterator" > IntoIterator< / a > ,
F: < a class = "trait" href = "https://doc.rust-lang.org/1.80.0/core/ops/function/trait.FnMut.html" title = "trait core::ops::function::FnMut" > FnMut< / a > (B, I::< a class = "associatedtype" href = "https://doc.rust-lang.org/1.80.0/core/iter/traits/collect/trait.IntoIterator.html#associatedtype.Item" title = "type core::iter::traits::collect::IntoIterator::Item" > Item< / a > ) -> B,< / div > < / code > < / pre > < details class = "toggle top-doc" open > < summary class = "hideme" > < span > Expand description< / span > < / summary > < div class = "docblock" > < p > Perform a fold operation over the iterable.< / p >
< p > < a href = "https://doc.rust-lang.org/1.80.0/core/iter/traits/collect/trait.IntoIterator.html" title = "trait core::iter::traits::collect::IntoIterator" > < code > IntoIterator< / code > < / a > enabled version of < a href = "https://doc.rust-lang.org/1.80.0/core/iter/traits/iterator/trait.Iterator.html#method.fold" title = "method core::iter::traits::iterator::Iterator::fold" > < code > Iterator::fold< / code > < / a > .< / p >
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< div class = "example-wrap" > < pre class = "rust rust-example-rendered" > < code > < span class = "kw" > use < / span > itertools::fold;
< span class = "macro" > assert_eq!< / span > (fold(< span class = "kw-2" > & < / span > [< span class = "number" > 1.< / span > , < span class = "number" > 2.< / span > , < span class = "number" > 3.< / span > ], < span class = "number" > 0.< / span > , |a, < span class = "kw-2" > & < / span > b| f32::max(a, b)), < span class = "number" > 3.< / span > );< / code > < / pre > < / div >
< / div > < / details > < / section > < / div > < / main > < / body > < / html >
