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Reactive ÐApp Development
</p> <p class="action"><a href="/getting-started/" class="nav-link action-button">Get Started</a></p></header> <div class="features"><div class="feature"><h2>Automatic Syncing</h2> <p>Subspace takes care of syncing under the hood, syncing exactly what you need when you need it. It saves the state to a local database ensuring the DApp always syncs from the last known point even after reloading the DApp.</p></div><div class="feature"><h2>Reactive</h2> <p>Subspace embraces reactive programming with RxJS. It provides methods to track and subscribe to events, contract state &amp; balances, and react to changes via observables.</p></div><div class="feature"><h2>Framework Agnostic</h2> <p>Subspace is framework agnostic and integrates well with your favourite frameworks, from React to Angular. It works in the browser and in nodejs.</p></div></div> <div class="theme-default-content custom content__default"><hr> <div id="intro" data-v-07c470a6><div class="code-container" data-v-07c470a6><div class="code-text" data-v-07c470a6><h3 data-v-07c470a6>Event Tracking &amp; Event Sourcing</h3>
You can track events and react to their values. With Subspace observables doing event sourcing is easy.
</div> <div class="code-content" data-v-07c470a6><div class="language-js line-numbers-mode" data-v-07c470a6><pre class="language-js" data-v-07c470a6><code data-v-07c470a6><span class="token keyword" data-v-07c470a6>import</span> <span class="token punctuation" data-v-07c470a6>{</span> $average<span class="token punctuation" data-v-07c470a6>,</span> $latest <span class="token punctuation" data-v-07c470a6>}</span> <span class="token keyword" data-v-07c470a6>from</span> <span class="token string" data-v-07c470a6>&quot;@embarklabs/subspace&quot;</span><span class="token punctuation" data-v-07c470a6>;</span>
<span class="token keyword" data-v-07c470a6>const</span> rating$ <span class="token operator" data-v-07c470a6>=</span> Product<span class="token punctuation" data-v-07c470a6>.</span>events<span class="token punctuation" data-v-07c470a6>.</span><span class="token function" data-v-07c470a6>Rating</span><span class="token punctuation" data-v-07c470a6>.</span><span class="token function" data-v-07c470a6>track</span><span class="token punctuation" data-v-07c470a6>(</span><span class="token punctuation" data-v-07c470a6>)</span><span class="token punctuation" data-v-07c470a6>.</span><span class="token function" data-v-07c470a6>map</span><span class="token punctuation" data-v-07c470a6>(</span><span class="token string" data-v-07c470a6>&quot;rating&quot;</span><span class="token punctuation" data-v-07c470a6>)</span><span class="token punctuation" data-v-07c470a6>)</span><span class="token punctuation" data-v-07c470a6>;</span>
rating$<span class="token punctuation" data-v-07c470a6>.</span><span class="token function" data-v-07c470a6>pipe</span><span class="token punctuation" data-v-07c470a6>(</span><span class="token function" data-v-07c470a6>$latest</span><span class="token punctuation" data-v-07c470a6>(</span><span class="token number" data-v-07c470a6>5</span><span class="token punctuation" data-v-07c470a6>)</span><span class="token punctuation" data-v-07c470a6>,</span> <span class="token function" data-v-07c470a6>$average</span><span class="token punctuation" data-v-07c470a6>(</span><span class="token punctuation" data-v-07c470a6>)</span><span class="token punctuation" data-v-07c470a6>)</span><span class="token punctuation" data-v-07c470a6>.</span><span class="token function" data-v-07c470a6>subscribe</span><span class="token punctuation" data-v-07c470a6>(</span><span class="token punctuation" data-v-07c470a6>(</span><span class="token parameter" data-v-07c470a6>rating</span><span class="token punctuation" data-v-07c470a6>)</span> <span class="token operator" data-v-07c470a6>=&gt;</span> <span class="token punctuation" data-v-07c470a6>{</span>
console<span class="token punctuation" data-v-07c470a6>.</span><span class="token function" data-v-07c470a6>log</span><span class="token punctuation" data-v-07c470a6>(</span><span class="token string" data-v-07c470a6>&quot;average rating of the last 5 events is &quot;</span> <span class="token operator" data-v-07c470a6>+</span> rating<span class="token punctuation" data-v-07c470a6>)</span>
<span class="token punctuation" data-v-07c470a6>}</span><span class="token punctuation" data-v-07c470a6>)</span><span class="token punctuation" data-v-07c470a6>;</span>
</code></pre> <div class="line-numbers-wrapper" data-v-07c470a6><span class="line-number" data-v-07c470a6>1</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>2</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>3</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>4</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>5</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>6</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>7</span><br data-v-07c470a6></div></div></div></div> <div class="code-container" data-v-07c470a6><div class="code-text" data-v-07c470a6><h3 data-v-07c470a6>Tracking State</h3>
You can track changes to a contract state variable, by specifying the view function and arguments to call and query the contract.
</div> <div class="code-content" data-v-07c470a6><div class="language-js line-numbers-mode" data-v-07c470a6><pre class="language-js" data-v-07c470a6><code data-v-07c470a6><span class="token keyword" data-v-07c470a6>const</span> productTitle$ <span class="token operator" data-v-07c470a6>=</span> ProductList<span class="token punctuation" data-v-07c470a6>.</span>methods<span class="token punctuation" data-v-07c470a6>.</span><span class="token function" data-v-07c470a6>products</span><span class="token punctuation" data-v-07c470a6>(</span><span class="token number" data-v-07c470a6>0</span><span class="token punctuation" data-v-07c470a6>)</span><span class="token punctuation" data-v-07c470a6>.</span><span class="token function" data-v-07c470a6>track</span><span class="token punctuation" data-v-07c470a6>(</span><span class="token punctuation" data-v-07c470a6>)</span><span class="token punctuation" data-v-07c470a6>.</span><span class="token function" data-v-07c470a6>map</span><span class="token punctuation" data-v-07c470a6>(</span><span class="token string" data-v-07c470a6>&quot;title&quot;</span><span class="token punctuation" data-v-07c470a6>)</span><span class="token punctuation" data-v-07c470a6>;</span>
productTitle$<span class="token punctuation" data-v-07c470a6>.</span><span class="token function" data-v-07c470a6>subscribe</span><span class="token punctuation" data-v-07c470a6>(</span><span class="token punctuation" data-v-07c470a6>(</span><span class="token parameter" data-v-07c470a6>title</span><span class="token punctuation" data-v-07c470a6>)</span> <span class="token operator" data-v-07c470a6>=&gt;</span> console<span class="token punctuation" data-v-07c470a6>.</span><span class="token function" data-v-07c470a6>log</span><span class="token punctuation" data-v-07c470a6>(</span><span class="token string" data-v-07c470a6>&quot;product title is &quot;</span> <span class="token operator" data-v-07c470a6>+</span> title<span class="token punctuation" data-v-07c470a6>)</span><span class="token punctuation" data-v-07c470a6>)</span><span class="token punctuation" data-v-07c470a6>;</span>
</code></pre> <div class="line-numbers-wrapper" data-v-07c470a6><span class="line-number" data-v-07c470a6>1</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>2</span><br data-v-07c470a6></div></div></div></div> <div class="code-container" data-v-07c470a6><div class="code-text" data-v-07c470a6><h3 data-v-07c470a6>Tracking balances</h3>
You can also track changes in both ETH and ERC20 token balances
</div> <div class="code-content" data-v-07c470a6><div class="language-js line-numbers-mode" data-v-07c470a6><pre class="language-js" data-v-07c470a6><code data-v-07c470a6><span class="token keyword" data-v-07c470a6>const</span> address <span class="token operator" data-v-07c470a6>=</span> <span class="token string" data-v-07c470a6>&quot;0x0001020304050607080900010203040506070809&quot;</span><span class="token punctuation" data-v-07c470a6>;</span>
subspace<span class="token punctuation" data-v-07c470a6>.</span><span class="token function" data-v-07c470a6>trackBalance</span><span class="token punctuation" data-v-07c470a6>(</span>address<span class="token punctuation" data-v-07c470a6>)</span><span class="token punctuation" data-v-07c470a6>.</span><span class="token function" data-v-07c470a6>subscribe</span><span class="token punctuation" data-v-07c470a6>(</span><span class="token punctuation" data-v-07c470a6>(</span><span class="token parameter" data-v-07c470a6>balance</span><span class="token punctuation" data-v-07c470a6>)</span> <span class="token operator" data-v-07c470a6>=&gt;</span> <span class="token punctuation" data-v-07c470a6>{</span>
console<span class="token punctuation" data-v-07c470a6>.</span><span class="token function" data-v-07c470a6>log</span><span class="token punctuation" data-v-07c470a6>(</span><span class="token string" data-v-07c470a6>&quot;ETH balance is &quot;</span><span class="token punctuation" data-v-07c470a6>,</span> balance<span class="token punctuation" data-v-07c470a6>)</span>
<span class="token punctuation" data-v-07c470a6>}</span><span class="token punctuation" data-v-07c470a6>)</span><span class="token punctuation" data-v-07c470a6>;</span>
subspace<span class="token punctuation" data-v-07c470a6>.</span><span class="token function" data-v-07c470a6>trackBalance</span><span class="token punctuation" data-v-07c470a6>(</span>address, <span class="token string" data-v-07c470a6>&quot;0x744d70fdbe2ba4cf95131626614a1763df805b9e&quot;</span><span class="token punctuation" data-v-07c470a6>)</span><span class="token punctuation" data-v-07c470a6>.</span><span class="token function" data-v-07c470a6>subscribe</span><span class="token punctuation" data-v-07c470a6>(</span><span class="token punctuation" data-v-07c470a6>(</span><span class="token parameter" data-v-07c470a6>balance</span><span class="token punctuation" data-v-07c470a6>)</span> <span class="token operator" data-v-07c470a6>=&gt;</span> <span class="token punctuation" data-v-07c470a6>{</span>
console<span class="token punctuation" data-v-07c470a6>.</span><span class="token function" data-v-07c470a6>log</span><span class="token punctuation" data-v-07c470a6>(</span><span class="token string" data-v-07c470a6>&quot;SNT balance is &quot;</span><span class="token punctuation" data-v-07c470a6>,</span> balance<span class="token punctuation" data-v-07c470a6>)</span>
<span class="token punctuation" data-v-07c470a6>}</span><span class="token punctuation" data-v-07c470a6>)</span><span class="token punctuation" data-v-07c470a6>;</span>
</code></pre> <div class="line-numbers-wrapper" data-v-07c470a6><span class="line-number" data-v-07c470a6>1</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>2</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>3</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>4</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>5</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>6</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>7</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>8</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>9</span><br data-v-07c470a6></div></div></div></div> <div class="code-container" data-v-07c470a6><div class="code-text" data-v-07c470a6><h3 data-v-07c470a6>React Integration</h3>
Subspace can make any react component compatible with observables so you easily reactive components
</div> <div class="code-content" data-v-07c470a6><div class="language-js line-numbers-mode" data-v-07c470a6><pre class="language-js" data-v-07c470a6><code data-v-07c470a6><span class="token keyword" data-v-07c470a6>import</span> <span class="token punctuation" data-v-07c470a6>{</span> observe <span class="token punctuation" data-v-07c470a6>}</span> <span class="token keyword" data-v-07c470a6>from</span> <span class="token string" data-v-07c470a6>&quot;@embarklabs/subspace/react&quot;</span><span class="token punctuation" data-v-07c470a6>;</span>
<span class="token keyword" data-v-07c470a6>const</span> <span class="token function-variable function" data-v-07c470a6>ProductComponent</span> <span class="token operator" data-v-07c470a6>=</span> <span class="token punctuation" data-v-07c470a6>(</span><span class="token parameter" data-v-07c470a6><span class="token punctuation" data-v-07c470a6>{</span> maxRating<span class="token punctuation" data-v-07c470a6>,</span> minRating<span class="token punctuation" data-v-07c470a6>,</span> averageRating <span class="token punctuation" data-v-07c470a6>}</span></span><span class="token punctuation" data-v-07c470a6>)</span> <span class="token operator" data-v-07c470a6>=&gt;</span> <span class="token punctuation" data-v-07c470a6>{</span>
<span class="token keyword" data-v-07c470a6>return</span> <span class="token operator" data-v-07c470a6>&lt;</span>ul<span class="token operator" data-v-07c470a6>&gt;</span>
<span class="token operator" data-v-07c470a6>&lt;</span>li<span class="token operator" data-v-07c470a6>&gt;</span><span class="token operator" data-v-07c470a6>&lt;</span>b<span class="token operator" data-v-07c470a6>&gt;</span>minimum rating<span class="token punctuation" data-v-07c470a6>:</span> <span class="token operator" data-v-07c470a6>&lt;</span><span class="token operator" data-v-07c470a6>/</span>b<span class="token operator" data-v-07c470a6>&gt;</span> <span class="token punctuation" data-v-07c470a6>{</span>minRating<span class="token punctuation" data-v-07c470a6>}</span><span class="token operator" data-v-07c470a6>&lt;</span><span class="token operator" data-v-07c470a6>/</span>li<span class="token operator" data-v-07c470a6>&gt;</span>
<span class="token operator" data-v-07c470a6>&lt;</span>li<span class="token operator" data-v-07c470a6>&gt;</span><span class="token operator" data-v-07c470a6>&lt;</span>b<span class="token operator" data-v-07c470a6>&gt;</span>maximum rating<span class="token punctuation" data-v-07c470a6>:</span> <span class="token operator" data-v-07c470a6>&lt;</span><span class="token operator" data-v-07c470a6>/</span>b<span class="token operator" data-v-07c470a6>&gt;</span> <span class="token punctuation" data-v-07c470a6>{</span>maxRating<span class="token punctuation" data-v-07c470a6>}</span><span class="token operator" data-v-07c470a6>&lt;</span><span class="token operator" data-v-07c470a6>/</span>li<span class="token operator" data-v-07c470a6>&gt;</span>
<span class="token operator" data-v-07c470a6>&lt;</span>li<span class="token operator" data-v-07c470a6>&gt;</span><span class="token operator" data-v-07c470a6>&lt;</span>b<span class="token operator" data-v-07c470a6>&gt;</span>average rating<span class="token punctuation" data-v-07c470a6>:</span> <span class="token operator" data-v-07c470a6>&lt;</span><span class="token operator" data-v-07c470a6>/</span>b<span class="token operator" data-v-07c470a6>&gt;</span> <span class="token punctuation" data-v-07c470a6>{</span>averageRating<span class="token punctuation" data-v-07c470a6>}</span><span class="token operator" data-v-07c470a6>&lt;</span><span class="token operator" data-v-07c470a6>/</span>li<span class="token operator" data-v-07c470a6>&gt;</span>
<span class="token operator" data-v-07c470a6>&lt;</span><span class="token operator" data-v-07c470a6>/</span>ul<span class="token operator" data-v-07c470a6>&gt;</span><span class="token punctuation" data-v-07c470a6>;</span>
<span class="token punctuation" data-v-07c470a6>}</span><span class="token punctuation" data-v-07c470a6>;</span>
<span class="token keyword" data-v-07c470a6>const</span> ReactiveProductComponent <span class="token operator" data-v-07c470a6>=</span> <span class="token function" data-v-07c470a6>observe</span><span class="token punctuation" data-v-07c470a6>(</span>ProductComponent<span class="token punctuation" data-v-07c470a6>)</span><span class="token punctuation" data-v-07c470a6>;</span>
<span class="token keyword" data-v-07c470a6>const</span> Product <span class="token operator" data-v-07c470a6>=</span> subspace<span class="token punctuation" data-v-07c470a6>.</span><span class="token function" data-v-07c470a6>contract</span><span class="token punctuation" data-v-07c470a6>(</span><span class="token punctuation" data-v-07c470a6>{</span>abi<span class="token punctuation" data-v-07c470a6>,</span> address<span class="token punctuation" data-v-07c470a6>}</span><span class="token punctuation" data-v-07c470a6>)</span><span class="token punctuation" data-v-07c470a6>;</span>
<span class="token keyword" data-v-07c470a6>const</span> rating$ <span class="token operator" data-v-07c470a6>=</span> Product<span class="token punctuation" data-v-07c470a6>.</span>events<span class="token punctuation" data-v-07c470a6>.</span>Rating<span class="token punctuation" data-v-07c470a6>.</span><span class="token function" data-v-07c470a6>track</span><span class="token punctuation" data-v-07c470a6>(</span><span class="token punctuation" data-v-07c470a6>)</span><span class="token punctuation" data-v-07c470a6>.</span><span class="token function" data-v-07c470a6>map</span><span class="token punctuation" data-v-07c470a6>(</span><span class="token string" data-v-07c470a6>&quot;rating&quot;</span><span class="token punctuation" data-v-07c470a6>)</span><span class="token punctuation" data-v-07c470a6>.</span><span class="token function" data-v-07c470a6>pipe</span><span class="token punctuation" data-v-07c470a6>(</span><span class="token function" data-v-07c470a6>map</span><span class="token punctuation" data-v-07c470a6>(</span><span class="token parameter" data-v-07c470a6>x</span> <span class="token operator" data-v-07c470a6>=&gt;</span> <span class="token function" data-v-07c470a6>parseInt</span><span class="token punctuation" data-v-07c470a6>(</span>x<span class="token punctuation" data-v-07c470a6>)</span><span class="token punctuation" data-v-07c470a6>)</span><span class="token punctuation" data-v-07c470a6>)</span><span class="token punctuation" data-v-07c470a6>;</span>
ReactDOM<span class="token punctuation" data-v-07c470a6>.</span><span class="token function" data-v-07c470a6>render</span><span class="token punctuation" data-v-07c470a6>(</span>
<span class="token operator" data-v-07c470a6>&lt;</span>ReactiveProductComponent
maxRating<span class="token operator" data-v-07c470a6>=</span><span class="token punctuation" data-v-07c470a6>{</span>rating$<span class="token punctuation" data-v-07c470a6>.</span><span class="token function" data-v-07c470a6>pipe</span><span class="token punctuation" data-v-07c470a6>(</span><span class="token function" data-v-07c470a6>$max</span><span class="token punctuation" data-v-07c470a6>(</span><span class="token punctuation" data-v-07c470a6>)</span><span class="token punctuation" data-v-07c470a6>)</span><span class="token punctuation" data-v-07c470a6>}</span>
minRating<span class="token operator" data-v-07c470a6>=</span><span class="token punctuation" data-v-07c470a6>{</span>rating$<span class="token punctuation" data-v-07c470a6>.</span><span class="token function" data-v-07c470a6>pipe</span><span class="token punctuation" data-v-07c470a6>(</span><span class="token function" data-v-07c470a6>$min</span><span class="token punctuation" data-v-07c470a6>(</span><span class="token punctuation" data-v-07c470a6>)</span><span class="token punctuation" data-v-07c470a6>)</span><span class="token punctuation" data-v-07c470a6>}</span>
averageRating<span class="token operator" data-v-07c470a6>=</span><span class="token punctuation" data-v-07c470a6>{</span>rating$<span class="token punctuation" data-v-07c470a6>.</span><span class="token function" data-v-07c470a6>pipe</span><span class="token punctuation" data-v-07c470a6>(</span><span class="token function" data-v-07c470a6>$average</span><span class="token punctuation" data-v-07c470a6>(</span><span class="token punctuation" data-v-07c470a6>)</span><span class="token punctuation" data-v-07c470a6>)</span><span class="token punctuation" data-v-07c470a6>}</span>
<span class="token operator" data-v-07c470a6>/</span><span class="token operator" data-v-07c470a6>&gt;</span><span class="token punctuation" data-v-07c470a6>,</span>
document<span class="token punctuation" data-v-07c470a6>.</span><span class="token function" data-v-07c470a6>getElementById</span><span class="token punctuation" data-v-07c470a6>(</span><span class="token string" data-v-07c470a6>'hello-example'</span><span class="token punctuation" data-v-07c470a6>)</span>
<span class="token punctuation" data-v-07c470a6>)</span><span class="token punctuation" data-v-07c470a6>;</span>
</code></pre> <div class="line-numbers-wrapper" data-v-07c470a6><span class="line-number" data-v-07c470a6>1</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>2</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>3</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>4</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>5</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>6</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>7</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>8</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>9</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>10</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>11</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>12</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>13</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>14</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>15</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>16</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>17</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>18</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>19</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>20</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>21</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>22</span><br data-v-07c470a6><span class="line-number" data-v-07c470a6>23</span><br data-v-07c470a6></div></div></div></div></div></div> <div class="footer">
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