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content="2"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><h1 id="interfaces">Interfaces</h1>
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<p>In go you can define a type using a set of methods by using the <code>interface</code> keyword.</p>
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<pre><code class="language-go">type instrumentSounds interface {
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makeBand() string
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}
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</code></pre>
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<p>So this is our instrumentSounds interface which calls a function makeBand.</p>
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<div style="padding-bottom:1rem;width:100%"><button class="button button--primary">open playground</button> <a href="https://goplay.tools/snippet/p-Ut2K0Fa9f" target="_blank" rel="noopener noreferrer">go to <!-- -->https://goplay.tools/snippet/p-Ut2K0Fa9f</a></div><pre class="prism-code language-go" style="background-color:#2a2734;color:#9a86fd">... loading sources<div class="token-line" style="color:#9a86fd"><span class="token plain" style="display:inline-block">
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</span></div></pre><div style="display:none"><div><button class="button button--lg button--secondary">load external go playground, with all it´s potentially evil cookies coming from https://goplay.tools</button></div></div>
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<h2 id="the-empty-interface">The Empty Interface</h2>
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<p>An empty interface can hold values that satisfy any type. It's commonly used in code when the values types are unknown.</p>
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<pre><code class="language-go">
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func main() {
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var myInterface interface{}
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myInterface = 300
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fmt.Println(myInterface)
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myInterface = "Hello world"
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fmt.Println(myInterface)
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}
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</code></pre>
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<p>Even though the type is changed this program will still work fine because myInterface is an empty interface so it could be of any type.
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In the latest of go the any type is supported, which is simply a type alias to the empty interface, and equivalent in all ways.</p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-tags-row row margin-bottom--sm"><div class="col"><b>Tags:</b><ul class="tags_jXut padding--none margin-left--sm"><li class="tag_QGVx"><a class="tag_zVej tagRegular_sFm0" href="/docs/tags/go-basics">Go Basics</a></li></ul></div></div><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/foomo/foomo-docs/tree/main/foomo/docs/backend/go-by-example/interfaces.mdx" target="_blank" rel="noopener noreferrer" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_vwxv"></div></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/docs/backend/go-by-example/http"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">HTTP Client and Server</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/backend/go-by-example/map-racing"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Map Races</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#the-empty-interface" class="table-of-contents__link toc-highlight">The Empty Interface</a></li></ul></div></div></div></div></main></div></div></div><footer class="footer"><div class="container container-fluid"><div class="row footer__links"><div class="col footer__col"><div class="footer__title">github</div><ul class="footer__items clean-list"><li class="footer__item"><a href="https://github.com/foomo" target="_blank" rel="noopener noreferrer" class="footer__link-item">https://github.com/foomo</a></li></ul></div><div class="col footer__col"><div class="footer__title">legal</div><ul class="footer__items clean-list"><li class="footer__item"><a class="footer__link-item" href="/etc/imprint">Imprint</a></li></ul></div></div><div class="footer__bottom text--center"><div class="footer__copyright">© 2024 bestbytes</div></div></div></footer></div>
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