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<p class='location'>Trait Index</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#foreign-impls">Implementations on Foreign Types</a><div class="sidebar-links"><a href="#impl-Index">usize</a><a href="#impl-Index">str</a><a href="#impl-Index">String</a><a href="#impl-Index">&'a T</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='../index.html'>serde_json</a>::<wbr><a href='index.html'>value</a></p><script>window.sidebarCurrent = {name: 'Index', ty: 'trait', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<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></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>−</span>]
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</span><a class='srclink' href='../../src/serde_json/value/index.rs.html#47-62' title='goto source code'>[src]</a></span></h1>
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<pre class='rust trait'>pub trait Index: Sealed { }</pre><div class='docblock'><p>A type that can be used to index into a <code>serde_json::Value</code>.</p>
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<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
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implements <code>Index</code>, as does the <a href="../enum.Value.html#impl-Index%3CI%3E">square-bracket indexing operator</a>. This
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trait is implemented for strings which are used as the index into a JSON
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map, and for <code>usize</code> which is used as the index into a JSON array.</p>
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<p>This trait is sealed and cannot be implemented for types outside of
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<code>serde_json</code>.</p>
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<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
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<pre class="rust rust-example-rendered">
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<span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="macro">json</span><span class="macro">!</span>({ <span class="string">"inner"</span>: [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>] });
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<span class="comment">// Data is a JSON map so it can be indexed with a string.</span>
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<span class="kw">let</span> <span class="ident">inner</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">data</span>[<span class="string">"inner"</span>];
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<span class="comment">// Inner is a JSON array so it can be indexed with an integer.</span>
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<span class="kw">let</span> <span class="ident">first</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">inner</span>[<span class="number">0</span>];
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">first</span>, <span class="number">1</span>);</pre>
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Implementations on Foreign Types<a href='#foreign-impls' class='anchor'></a>
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<h3 id='impl-Index' class='impl'><span class='in-band'><code>impl <a class="trait" href="../../serde_json/value/trait.Index.html" title="trait serde_json::value::Index">Index</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a></code><a href='#impl-Index' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/serde_json/value/index.rs.html#64-91' title='goto source code'>[src]</a></span></h3>
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<span class='docblock autohide'><div class='impl-items'><h4 id='method.index_into' class="method"><span id='index_into.v' class='invisible'><code>fn <a href='#method.index_into' class='fnname'>index_into</a><'v>(&self, v: &'v <a class="enum" href="../../serde_json/value/enum.Value.html" title="enum serde_json::value::Value">Value</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'v <a class="enum" href="../../serde_json/value/enum.Value.html" title="enum serde_json::value::Value">Value</a>></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/serde_json/value/index.rs.html#65-70' title='goto source code'>[src]</a></span></h4>
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<h4 id='method.index_into_mut' class="method"><span id='index_into_mut.v' class='invisible'><code>fn <a href='#method.index_into_mut' class='fnname'>index_into_mut</a><'v>(&self, v: &'v mut <a class="enum" href="../../serde_json/value/enum.Value.html" title="enum serde_json::value::Value">Value</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'v mut <a class="enum" href="../../serde_json/value/enum.Value.html" title="enum serde_json::value::Value">Value</a>></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/serde_json/value/index.rs.html#71-76' title='goto source code'>[src]</a></span></h4>
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<h4 id='method.index_or_insert' class="method"><span id='index_or_insert.v' class='invisible'><code>fn <a href='#method.index_or_insert' class='fnname'>index_or_insert</a><'v>(&self, v: &'v mut <a class="enum" href="../../serde_json/value/enum.Value.html" title="enum serde_json::value::Value">Value</a>) -> &'v mut <a class="enum" href="../../serde_json/value/enum.Value.html" title="enum serde_json::value::Value">Value</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/serde_json/value/index.rs.html#77-90' title='goto source code'>[src]</a></span></h4>
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</div></span><h3 id='impl-Index-1' class='impl'><span class='in-band'><code>impl <a class="trait" href="../../serde_json/value/trait.Index.html" title="trait serde_json::value::Index">Index</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a></code><a href='#impl-Index-1' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/serde_json/value/index.rs.html#93-115' title='goto source code'>[src]</a></span></h3>
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<span class='docblock autohide'><div class='impl-items'><h4 id='method.index_into-1' class="method"><span id='index_into.v-1' class='invisible'><code>fn <a href='#method.index_into' class='fnname'>index_into</a><'v>(&self, v: &'v <a class="enum" href="../../serde_json/value/enum.Value.html" title="enum serde_json::value::Value">Value</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'v <a class="enum" href="../../serde_json/value/enum.Value.html" title="enum serde_json::value::Value">Value</a>></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/serde_json/value/index.rs.html#94-99' title='goto source code'>[src]</a></span></h4>
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<h4 id='method.index_into_mut-1' class="method"><span id='index_into_mut.v-1' class='invisible'><code>fn <a href='#method.index_into_mut' class='fnname'>index_into_mut</a><'v>(&self, v: &'v mut <a class="enum" href="../../serde_json/value/enum.Value.html" title="enum serde_json::value::Value">Value</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'v mut <a class="enum" href="../../serde_json/value/enum.Value.html" title="enum serde_json::value::Value">Value</a>></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/serde_json/value/index.rs.html#100-105' title='goto source code'>[src]</a></span></h4>
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<h4 id='method.index_or_insert-1' class="method"><span id='index_or_insert.v-1' class='invisible'><code>fn <a href='#method.index_or_insert' class='fnname'>index_or_insert</a><'v>(&self, v: &'v mut <a class="enum" href="../../serde_json/value/enum.Value.html" title="enum serde_json::value::Value">Value</a>) -> &'v mut <a class="enum" href="../../serde_json/value/enum.Value.html" title="enum serde_json::value::Value">Value</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/serde_json/value/index.rs.html#106-114' title='goto source code'>[src]</a></span></h4>
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</div></span><h3 id='impl-Index-2' class='impl'><span class='in-band'><code>impl <a class="trait" href="../../serde_json/value/trait.Index.html" title="trait serde_json::value::Index">Index</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/string/struct.String.html" title="struct alloc::string::String">String</a></code><a href='#impl-Index-2' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/serde_json/value/index.rs.html#117-127' title='goto source code'>[src]</a></span></h3>
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<span class='docblock autohide'><div class='impl-items'><h4 id='method.index_into-2' class="method"><span id='index_into.v-2' class='invisible'><code>fn <a href='#method.index_into' class='fnname'>index_into</a><'v>(&self, v: &'v <a class="enum" href="../../serde_json/value/enum.Value.html" title="enum serde_json::value::Value">Value</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'v <a class="enum" href="../../serde_json/value/enum.Value.html" title="enum serde_json::value::Value">Value</a>></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/serde_json/value/index.rs.html#118-120' title='goto source code'>[src]</a></span></h4>
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</div></span><h3 id='impl-Index-3' class='impl'><span class='in-band'><code>impl<'a, T: ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>> <a class="trait" href="../../serde_json/value/trait.Index.html" title="trait serde_json::value::Index">Index</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'a </a>T <span class="where fmt-newline">where<br> T: <a class="trait" href="../../serde_json/value/trait.Index.html" title="trait serde_json::value::Index">Index</a>, </span></code><a href='#impl-Index-3' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/serde_json/value/index.rs.html#129-142' title='goto source code'>[src]</a></span></h3>
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