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Listen to balance change
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Unsubscribe from listening
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Read chain state
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Make a transfer
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Display system events
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<h1>
<i class="fa fa-circle-o-notch fa-spin"></i>
<a href="../../.." >Unsubscribe from listening</a>
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<h1 id="unsubscribe-from-listening-to-updates">Unsubscribe from listening to updates</h1>
<p>This example shows how to subscribe to and later unsubscribe from listening to block updates.</p>
<p>In this example we&apos;re calling the built-in unsubscribe() function after a timeOut of 20s to cleanup and unsubscribe from listening to updates.</p>
<pre><code class="lang-javascript"><div class="sunlight-container sunlight-theme-gitbook"><div class="sunlight-code-container"><pre class="sunlight-highlight-javascript sunlight-highlighted"><span class="sunlight-javascript"><span class="sunlight-comment">//&#xA0;Import&#xA0;the&#xA0;API</span>
<span class="sunlight-reservedWord">const</span>&#xA0;<span class="sunlight-punctuation">{</span>&#xA0;<span class="sunlight-ident">ApiRx</span>&#xA0;<span class="sunlight-punctuation">}</span>&#xA0;<span class="sunlight-operator">=</span>&#xA0;<span class="sunlight-ident">require</span><span class="sunlight-punctuation">(</span><span class="sunlight-string">&apos;@polkadot/api&apos;</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
<span class="sunlight-reservedWord">const</span>&#xA0;<span class="sunlight-punctuation">{</span>&#xA0;<span class="sunlight-ident">switchMap</span>&#xA0;<span class="sunlight-punctuation">}</span>&#xA0;<span class="sunlight-operator">=</span>&#xA0;<span class="sunlight-ident">require</span><span class="sunlight-punctuation">(</span><span class="sunlight-string">&apos;rxjs/operators&apos;</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
<span class="sunlight-ident">async</span>&#xA0;<span class="sunlight-keyword">function</span>&#xA0;<span class="sunlight-named-ident">main</span>&#xA0;<span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">)</span>&#xA0;<span class="sunlight-punctuation">{</span>
&#xA0;&#xA0;<span class="sunlight-comment">//&#xA0;Create&#xA0;a&#xA0;new&#xA0;instance&#xA0;of&#xA0;the&#xA0;api</span>
&#xA0;&#xA0;<span class="sunlight-comment">//&#xA0;Subscribe&#xA0;to&#xA0;chain&#xA0;updates&#xA0;and&#xA0;log&#xA0;the&#xA0;current&#xA0;block&#xA0;&#xA0;number&#xA0;on&#xA0;update.</span>
&#xA0;&#xA0;<span class="sunlight-reservedWord">const</span>&#xA0;<span class="sunlight-ident">subscription</span>&#xA0;<span class="sunlight-operator">=</span>&#xA0;<span class="sunlight-keyword">new</span>&#xA0;<span class="sunlight-ident">ApiRx</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">)</span><span class="sunlight-operator">.</span><span class="sunlight-ident">isReady</span>
&#xA0;&#xA0;&#xA0;&#xA0;<span class="sunlight-operator">.</span><span class="sunlight-ident">pipe</span><span class="sunlight-punctuation">(</span>
&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;<span class="sunlight-ident">switchMap</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">(</span><span class="sunlight-ident">api</span><span class="sunlight-punctuation">)</span>&#xA0;<span class="sunlight-operator">=</span><span class="sunlight-operator">&gt;</span>
&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;<span class="sunlight-ident">api</span><span class="sunlight-operator">.</span><span class="sunlight-ident">rpc</span><span class="sunlight-operator">.</span><span class="sunlight-ident">chain</span><span class="sunlight-operator">.</span><span class="sunlight-ident">subscribeNewHead</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">)</span>
&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;<span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">)</span>
&#xA0;&#xA0;&#xA0;&#xA0;<span class="sunlight-operator">.</span><span class="sunlight-ident">subscribe</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">(</span><span class="sunlight-ident">header</span><span class="sunlight-punctuation">)</span>&#xA0;<span class="sunlight-operator">=</span><span class="sunlight-operator">&gt;</span>&#xA0;<span class="sunlight-punctuation">{</span>
&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;<span class="sunlight-ident">console</span><span class="sunlight-operator">.</span><span class="sunlight-ident">log</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">`</span><span class="sunlight-ident">Chain</span>&#xA0;<span class="sunlight-ident">is</span>&#xA0;<span class="sunlight-ident">at</span>&#xA0;<span class="sunlight-ident">block</span><span class="sunlight-operator">:</span>&#xA0;<span class="sunlight-punctuation">#</span><span class="sunlight-ident">$</span><span class="sunlight-punctuation">{</span><span class="sunlight-ident">header</span><span class="sunlight-operator">.</span><span class="sunlight-ident">blockNumber</span><span class="sunlight-punctuation">}</span><span class="sunlight-punctuation">`</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
&#xA0;&#xA0;&#xA0;&#xA0;<span class="sunlight-punctuation">}</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
&#xA0;&#xA0;<span class="sunlight-comment">//&#xA0;In&#xA0;this&#xA0;example&#xA0;we&apos;re&#xA0;calling&#xA0;the&#xA0;Overvables&#xA0;unsubscribe()&#xA0;//</span>
&#xA0;&#xA0;<span class="sunlight-comment">//&#xA0;function&#xA0;after&#xA0;20s.</span>
&#xA0;&#xA0;<span class="sunlight-ident">setTimeout</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">)</span>&#xA0;<span class="sunlight-operator">=</span><span class="sunlight-operator">&gt;</span>&#xA0;<span class="sunlight-punctuation">{</span>
&#xA0;&#xA0;&#xA0;&#xA0;<span class="sunlight-ident">subscription</span><span class="sunlight-operator">.</span><span class="sunlight-ident">unsubscribe</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
&#xA0;&#xA0;&#xA0;&#xA0;<span class="sunlight-ident">console</span><span class="sunlight-operator">.</span><span class="sunlight-ident">log</span><span class="sunlight-punctuation">(</span><span class="sunlight-string">&apos;Unsubscribed&apos;</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
&#xA0;&#xA0;<span class="sunlight-punctuation">}</span><span class="sunlight-punctuation">,</span>&#xA0;<span class="sunlight-number">20000</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
<span class="sunlight-punctuation">}</span>
<span class="sunlight-ident">main</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">)</span><span class="sunlight-operator">.</span><span class="sunlight-keyword">catch</span><span class="sunlight-punctuation">(</span><span class="sunlight-ident">console</span><span class="sunlight-operator">.</span><span class="sunlight-ident">error</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
</span></pre></div></div></code></pre>
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