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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="A type that can be used to index into a `serde_json::Value`."><meta name="keywords" content="rust, rustlang, rust-lang, Index"><title>Index in serde_json::value - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script src="../../crates.js"></script><script defer src="../../main.js"></script>
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</a><h2 class="location">Trait Index</h2><div class="sidebar-elems"><div class="block items"><h3 class="sidebar-title"><a href="#foreign-impls">Implementations on Foreign Types</a></h3><div class="sidebar-links"><a href="#impl-Index-for-%26%27a%20T">&amp;&#39;a T</a><a href="#impl-Index-for-String">String</a><a href="#impl-Index-for-str">str</a><a href="#impl-Index-for-usize">usize</a></div><h3 class="sidebar-title"><a href="#implementors">Implementors</a></h3></div><h2 class="location">Other items in<br><a href="../index.html">serde_json</a>::<wbr><a href="index.html">value</a></h2><div id="sidebar-vars" data-name="Index" data-ty="trait" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../../serde_json/index.html"><img class="rust-logo" src="../../rust-logo.png" alt="logo"></a><nav class="sub"><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../../brush.svg"></button><div id="theme-choices" role="menu"></div></div><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press S to search, ? for more options…" type="search"></div><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../../settings.html" title="settings"><img width="18" height="18" alt="Change settings" src="../../wheel.svg"></a></div></form></nav></div><section id="main-content" class="content"><h1 class="fqn"><span class="in-band">Trait <a href="../index.html">serde_json</a>::<wbr><a href="index.html">value</a>::<wbr><a class="trait" href="#">Index</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span><a class="srclink" href="../../src/serde_json/value/index.rs.html#37-52" title="goto source code">[src]</a></span></h1><div class="docblock item-decl"><pre class="rust trait"><code>pub trait Index: Sealed { }</code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A type that can be used to index into a <code>serde_json::Value</code>.</p>
<p>The <a href="../enum.Value.html#method.get"><code>get</code></a> and <a href="../enum.Value.html#method.get_mut"><code>get_mut</code></a> methods of <code>Value</code> accept any type that
implements <code>Index</code>, as does the <a href="../enum.Value.html#impl-Index%3CI%3E">square-bracket indexing operator</a>. This
trait is implemented for strings which are used as the index into a JSON
map, and for <code>usize</code> which is used as the index into a JSON array.</p>
<p>This trait is sealed and cannot be implemented for types outside of
<code>serde_json</code>.</p>
<h2 id="examples" class="section-header"><a href="#examples">Examples</a></h2>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="macro">json!</span>({ <span class="string">&quot;inner&quot;</span>: [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>] });
<span class="comment">// Data is a JSON map so it can be indexed with a string.</span>
<span class="kw">let</span> <span class="ident">inner</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">data</span>[<span class="string">&quot;inner&quot;</span>];
<span class="comment">// Inner is a JSON array so it can be indexed with an integer.</span>
<span class="kw">let</span> <span class="ident">first</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">inner</span>[<span class="number">0</span>];
<span class="macro">assert_eq!</span>(<span class="ident">first</span>, <span class="number">1</span>);</code></pre></div>
</div></details><h2 id="foreign-impls" class="small-section-header">Implementations on Foreign Types<a href="#foreign-impls" class="anchor"></a></h2><div id="impl-Index-for-usize" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde_json/value/index.rs.html#54-81" title="goto source code">[src]</a></div><a href="#impl-Index-for-usize" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="trait.Index.html" title="trait serde_json::value::Index">Index</a> for <a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.usize.html">usize</a></h3></div><div id="impl-Index-for-str" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde_json/value/index.rs.html#83-105" title="goto source code">[src]</a></div><a href="#impl-Index-for-str" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="trait.Index.html" title="trait serde_json::value::Index">Index</a> for <a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.str.html">str</a></h3></div><div id="impl-Index-for-String" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde_json/value/index.rs.html#107-117" title="goto source code">[src]</a></div><a href="#impl-Index-for-String" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="trait.Index.html" title="trait serde_json::value::Index">Index</a> for <a class="struct" href="https://doc.rust-lang.org/1.59.0/alloc/string/struct.String.html" title="struct alloc::string::String">String</a></h3></div><div id="impl-Index-for-%26%27a%20T" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde_json/value/index.rs.html#119-132" title="goto source code">[src]</a></div><a href="#impl-Index-for-%26%27a%20T" class="anchor"></a><h3 class="code-header in-band">impl&lt;'a, T&gt; <a class="trait" href="trait.Index.html" title="trait serde_json::value::Index">Index</a> for <a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.reference.html">&amp;'a </a>T <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: ?<a class="trait" href="https://doc.rust-lang.org/1.59.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="trait.Index.html" title="trait serde_json::value::Index">Index</a>,&nbsp;</span></h3></div><h2 id="implementors" class="small-section-header">Implementors<a href="#implementors" class="anchor"></a></h2><div class="item-list" id="implementors-list"></div><script type="text/javascript" src="../../implementors/serde_json/value/trait.Index.js" async></script></section><section id="search" class="content hidden"></section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="serde_json" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.59.0 (9d1b2106e 2022-02-23)" ></div>
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