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class="VPLink link link" href="/sigpro/api/quick.html" data-v-a4b0d9bf><!--[--><p class="text" data-v-a4b0d9bf>Quick Start</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-a4b0d9bf data-v-a4b0d9bf><div class="item" data-v-a4b0d9bf><div class="indicator" data-v-a4b0d9bf></div><a class="VPLink link link" href="/sigpro/api/$.html" data-v-a4b0d9bf><!--[--><p class="text" data-v-a4b0d9bf>$</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-a4b0d9bf data-v-a4b0d9bf><div class="item" data-v-a4b0d9bf><div class="indicator" data-v-a4b0d9bf></div><a class="VPLink link link" href="/sigpro/api/html.html" data-v-a4b0d9bf><!--[--><p class="text" data-v-a4b0d9bf>$.html</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-a4b0d9bf data-v-a4b0d9bf><div class="item" data-v-a4b0d9bf><div class="indicator" data-v-a4b0d9bf></div><a class="VPLink link link" href="/sigpro/api/mount.html" data-v-a4b0d9bf><!--[--><p class="text" data-v-a4b0d9bf>$.mount</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-a4b0d9bf data-v-a4b0d9bf><div class="item" data-v-a4b0d9bf><div class="indicator" data-v-a4b0d9bf></div><a class="VPLink link link" href="/sigpro/api/tags.html" data-v-a4b0d9bf><!--[--><p class="text" data-v-a4b0d9bf>Tags</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><div class="no-transition group" data-v-9e426adc><section class="VPSidebarItem level-0" data-v-9e426adc data-v-a4b0d9bf><div class="item" role="button" tabindex="0" data-v-a4b0d9bf><div class="indicator" data-v-a4b0d9bf></div><h2 class="text" data-v-a4b0d9bf>Plugins</h2><!----></div><div class="items" data-v-a4b0d9bf><!--[--><div class="VPSidebarItem level-1 is-link" data-v-a4b0d9bf data-v-a4b0d9bf><div class="item" data-v-a4b0d9bf><div class="indicator" data-v-a4b0d9bf></div><a class="VPLink link link" href="/sigpro/plugins/quick.html" 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class="main" data-v-83890dd9><div style="position:relative;" class="vp-doc _sigpro_api_$" data-v-83890dd9><div><h1 id="the-reactive-core" tabindex="-1">The Reactive Core: <code>$( )</code> <a class="header-anchor" href="#the-reactive-core" aria-label="Permalink to "The Reactive Core: `$( )`""></a></h1><p>The <code>$</code> function is the heart of <strong>SigPro</strong>. It is a <strong>Unified Reactive Constructor</strong> that handles state, derivations, and side effects through a single, consistent interface.</p><h2 id="_1-the-constructor-input" tabindex="-1">1. The Constructor: <code>$( input )</code> <a class="header-anchor" href="#_1-the-constructor-input" aria-label="Permalink to "1. The Constructor: `$( input )`""></a></h2><p>Depending on what you pass into <code>$( )</code>, SigPro creates a different type of reactive primitive:</p><table tabindex="0"><thead><tr><th style="text-align:left;">Input Type</th><th style="text-align:left;">Result</th><th style="text-align:left;">Internal Behavior</th></tr></thead><tbody><tr><td style="text-align:left;"><strong>Value</strong> (String, Number, Object...)</td><td style="text-align:left;"><strong>Signal</strong></td><td style="text-align:left;">Creates a piece of mutable state.</td></tr><tr><td style="text-align:left;"><strong>Function</strong></td><td style="text-align:left;"><strong>Computed / Effect</strong></td><td style="text-align:left;">Creates a derived value that tracks dependencies.</td></tr></tbody></table><hr><h2 id="_2-signal-state" tabindex="-1">2. Signal (State) <a class="header-anchor" href="#_2-signal-state" aria-label="Permalink to "2. Signal (State)""></a></h2><p>A <strong>Signal</strong> is a "box" that holds a value. It provides a getter/setter function to interact with that value.</p><ul><li><strong>When to use:</strong> For data that changes over time (counters, user input, toggle states, API data).</li><li><strong>Syntax:</strong> <code>const $state = $(initialValue);</code></li></ul><h3 id="example" tabindex="-1">Example: <a class="header-anchor" href="#example" aria-label="Permalink to "Example:""></a></h3><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> $name</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> $</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">"Alice"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">);</span></span>
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<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// Read the value (Getter)</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">$name</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">()); </span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// "Alice"</span></span>
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<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// Update the value (Setter)</span></span>
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<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">$name</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">"Bob"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">); </span></span>
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<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// Update based on previous value</span></span>
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<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">$name</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">current</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =></span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> current </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">+</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> " Smith"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">);</span></span></code></pre></div><hr><h2 id="_3-computed-derived-state" tabindex="-1">3. Computed (Derived State) <a class="header-anchor" href="#_3-computed-derived-state" aria-label="Permalink to "3. Computed (Derived State)""></a></h2><p>When you pass a <strong>function</strong> to <code>$( )</code> that <strong>returns a value</strong>, SigPro creates a <strong>Computed Signal</strong>. It automatically tracks which signals are used inside it and re-runs only when they change.</p><ul><li><strong>When to use:</strong> For values that depend on other signals (totals, filtered lists, formatted strings).</li><li><strong>Syntax:</strong> <code>const $derived = $(() => logic);</code></li></ul><h3 id="example-1" tabindex="-1">Example: <a class="header-anchor" href="#example-1" aria-label="Permalink to "Example:""></a></h3><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> $price</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> $</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">100</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">);</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> $qty</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> $</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">2</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">);</span></span>
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<span class="line"></span>
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<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// Automatically tracks $price and $qty</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> $total</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> $</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(() </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=></span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> $price</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">() </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">*</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> $qty</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">());</span></span>
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<span class="line"></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">$total</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">()); </span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// 200</span></span>
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<span class="line"></span>
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<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">$qty</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">3</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">); </span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// $total updates to 300 automatically</span></span></code></pre></div><hr><h2 id="_4-effects-side-effects" tabindex="-1">4. Effects (Side Effects) <a class="header-anchor" href="#_4-effects-side-effects" aria-label="Permalink to "4. Effects (Side Effects)""></a></h2><p>An <strong>Effect</strong> is a function passed to <code>$( )</code> that <strong>does not return a value</strong> (or returns <code>undefined</code>). SigPro treats this as a subscription that performs an action whenever its dependencies change.</p><ul><li><strong>When to use:</strong> For DOM manipulations, logging, or syncing with external APIs (LocalStorage, Fetch).</li><li><strong>Syntax:</strong> <code>$(() => { action });</code></li></ul><h3 id="example-2" tabindex="-1">Example: <a class="header-anchor" href="#example-2" aria-label="Permalink to "Example:""></a></h3><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> $theme</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> $</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">"light"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">);</span></span>
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<span class="line"></span>
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<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// This effect runs every time $theme changes</span></span>
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<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">$</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(() </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=></span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> document.body.className </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> $theme</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">();</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">"Theme updated to:"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">$theme</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">());</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">});</span></span>
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<span class="line"></span>
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<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">$theme</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">"dark"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">); </span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// Logs: Theme updated to: dark</span></span></code></pre></div><hr><h2 id="_5-summary-table-usage-guide" tabindex="-1">5. Summary Table: Usage Guide <a class="header-anchor" href="#_5-summary-table-usage-guide" aria-label="Permalink to "5. Summary Table: Usage Guide""></a></h2><table tabindex="0"><thead><tr><th style="text-align:left;">Primitive</th><th style="text-align:left;">Logic Type</th><th style="text-align:left;">Returns Value?</th><th style="text-align:left;">Typical Use Case</th></tr></thead><tbody><tr><td style="text-align:left;"><strong>Signal</strong></td><td style="text-align:left;">Static</td><td style="text-align:left;">Yes (Mutable)</td><td style="text-align:left;"><code>const $user = $("Guest")</code></td></tr><tr><td style="text-align:left;"><strong>Computed</strong></td><td style="text-align:left;">Read-only</td><td style="text-align:left;">Yes (Automatic)</td><td style="text-align:left;"><code>const $isLoggedIn = $(() => $user() !== "Guest")</code></td></tr><tr><td style="text-align:left;"><strong>Effect</strong></td><td style="text-align:left;">Imperative</td><td style="text-align:left;">No</td><td style="text-align:left;"><code>$(() => localStorage.setItem('user', $user()))</code></td></tr></tbody></table><hr><h2 id="💡-pro-tip-naming-convention" tabindex="-1">💡 Pro Tip: Naming Convention <a class="header-anchor" href="#💡-pro-tip-naming-convention" aria-label="Permalink to "💡 Pro Tip: Naming Convention""></a></h2><p>In SigPro, we use the <strong><code>$</code> prefix</strong> (e.g., <code>$count</code>) for variables that hold a reactive function. This makes it easy to distinguish between a standard variable and a reactive one at a glance:</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">let</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> count </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 0</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">; </span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// Static</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> $count</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> $</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">0</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">); </span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// Reactive (Function)</span></span></code></pre></div></div></div></main><footer class="VPDocFooter" data-v-83890dd9 data-v-4f9813fa><!--[--><!--]--><!----><nav class="prev-next" aria-labelledby="doc-footer-aria-label" data-v-4f9813fa><span class="visually-hidden" id="doc-footer-aria-label" data-v-4f9813fa>Pager</span><div class="pager" data-v-4f9813fa><a class="VPLink link pager-link prev" href="/sigpro/api/quick.html" data-v-4f9813fa><!--[--><span class="desc" data-v-4f9813fa>Previous page</span><span class="title" data-v-4f9813fa>Quick Start</span><!--]--></a></div><div class="pager" data-v-4f9813fa><a class="VPLink link pager-link next" href="/sigpro/api/html.html" data-v-4f9813fa><!--[--><span class="desc" data-v-4f9813fa>Next page</span><span class="title" data-v-4f9813fa>$.html</span><!--]--></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><!----><!--[--><!--]--></div></div>
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