<!DOCTYPE html><htmllang="en"><head><metacharset="utf-8"><metaname="viewport"content="width=device-width, initial-scale=1.0"><metaname="generator"content="rustdoc"><metaname="description"content="Compares every element yielded by both `i` and `j` with the given function in lock-step and returns a `Diff` which describes how `j` differs from `i`."><title>diff_with in itertools - Rust</title><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><linkrel="stylesheet"href="../static.files/normalize-76eba96aa4d2e634.css"><linkrel="stylesheet"href="../static.files/rustdoc-5bc39a1768837dd0.css"><metaname="rustdoc-vars"data-root-path="../"data-static-root-path="../static.files/"data-current-crate="itertools"data-themes=""data-resource-suffix=""data-rustdoc-version="1.77.2 (25ef9e3d8 2024-04-09)"data-channel="1.77.2"data-search-js="search-dd67cee4cfa65049.js"data-settings-js="settings-4313503d2e1961c2.js"><scriptsrc="../static.files/storage-4c98445ec4002617.js"></script><scriptdefersrc="sidebar-items.js"></script><scriptdefersrc="../static.files/main-48f368f3872407c8.js"></script><noscript><linkrel="stylesheet"href="../static.files/noscript-04d5337699b92874.css"></noscript><linkrel="alternate icon"type="image/png"href="../static.files/favicon-16x16-8b506e7a72182f1c.png"><linkrel="alternate icon"type="image/png"href="../static.files/favicon-32x32-422f7d1d52889060.png"><linkrel="icon"type="image/svg+xml"href="../static.files/favicon-2c020d218678b618.svg"></head><bodyclass="rustdoc fn"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><navclass="mobile-topbar"><buttonclass="sidebar-menu-toggle"title="show sidebar"></button></nav><navclass="sidebar"><divclass="sidebar-crate"><h2><ahref="../itertools/index.html">itertools</a><spanclass="version">0.12.1</span></h2></div><divclass="sidebar-elems"></div></nav><divclass="sidebar-resizer"></div>
<main><divclass="width-limiter"><navclass="sub"><formclass="search-form"><span></span><divid="sidebar-button"tabindex="-1"><ahref="../itertools/all.html"title="show sidebar"></a></div><inputclass="search-input"name="search"aria-label="Run search in the documentation"autocomplete="off"spellcheck="false"placeholder="Click or press ‘S’ to search, ‘?’ for more options…"type="search"><divid="help-button"tabindex="-1"><ahref="../help.html"title="help">?</a></div><divid="settings-menu"tabindex="-1"><ahref="../settings.html"title="settings"><imgwidth="22"height="22"alt="Change settings"src="../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><sectionid="main-content"class="content"><divclass="main-heading"><h1>Function <ahref="index.html">itertools</a>::<wbr><aclass="fn"href="#">diff_with</a><buttonid="copy-path"title="Copy item path to clipboard"><imgsrc="../static.files/clipboard-7571035ce49a181d.svg"width="19"height="18"alt="Copy item path"></button></h1><spanclass="out-of-band"><aclass="src"href="../src/itertools/diff.rs.html#80-104">source</a> · <buttonid="toggle-all-docs"title="collapse all docs">[<span>−</span>]</button></span></div><preclass="rust item-decl"><code>pub fn diff_with<I, J, F>(
F: <aclass="trait"href="https://doc.rust-lang.org/1.77.2/core/ops/function/trait.Fn.html"title="trait core::ops::function::Fn">Fn</a>(&I::<aclass="associatedtype"href="https://doc.rust-lang.org/1.77.2/core/iter/traits/collect/trait.IntoIterator.html#associatedtype.Item"title="type core::iter::traits::collect::IntoIterator::Item">Item</a>, &J::<aclass="associatedtype"href="https://doc.rust-lang.org/1.77.2/core/iter/traits/collect/trait.IntoIterator.html#associatedtype.Item"title="type core::iter::traits::collect::IntoIterator::Item">Item</a>) -><aclass="primitive"href="https://doc.rust-lang.org/1.77.2/std/primitive.bool.html">bool</a>,</div></code></pre><detailsclass="toggle top-doc"open><summaryclass="hideme"><span>Expand description</span></summary><divclass="docblock"><p>Compares every element yielded by both <code>i</code> and <code>j</code> with the given function in lock-step and
returns a <ahref="enum.Diff.html"title="enum itertools::Diff"><code>Diff</code></a> which describes how <code>j</code> differs from <code>i</code>.</p>
<p>If the number of elements yielded by <code>j</code> is less than the number of elements yielded by <code>i</code>,
the number of <code>j</code> elements yielded will be returned along with <code>i</code>’s remaining elements as
<code>Diff::Shorter</code>.</p>
<p>If the two elements of a step differ, the index of those elements along with the remaining
elements of both <code>i</code> and <code>j</code> are returned as <code>Diff::FirstMismatch</code>.</p>
<p>If <code>i</code> becomes exhausted before <code>j</code> becomes exhausted, the number of elements in <code>i</code> along with
the remaining <code>j</code> elements will be returned as <code>Diff::Longer</code>.</p>
