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<ol class="breadcrumb">
<li>Classes</li>
<li>AccountIndex</li>
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<a href="#info" role="tab" id="info-tab" data-toggle="tab" data-link="info">Info</a>
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<p class="comment">
<h3>File</h3>
</p>
<p class="comment">
<code>src/app/_eth/accountIndex.ts</code>
</p>
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<p class="comment">
<h3>Description</h3>
</p>
<p class="comment">
<p>Provides an instance of the accounts registry contract.
Allows querying of accounts that have been registered as valid accounts in the network.</p>
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</p>
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<p class="comment">
<h3>Example</h3>
</p>
<div class="io-description">
</div>
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<section>
<h3 id="index">Index</h3>
<table class="table table-sm table-bordered index-table">
<tbody>
<tr>
<td class="col-md-4">
<h6><b>Properties</b></h6>
</td>
</tr>
<tr>
<td class="col-md-4">
<ul class="index-list">
<li>
<a href="#contract">contract</a>
</li>
<li>
<a href="#contractAddress">contractAddress</a>
</li>
<li>
<a href="#signerAddress">signerAddress</a>
</li>
</ul>
</td>
</tr>
<tr>
<td class="col-md-4">
<h6><b>Methods</b></h6>
</td>
</tr>
<tr>
<td class="col-md-4">
<ul class="index-list">
<li>
<span class="modifier">Public</span>
<span class="modifier">Async</span>
<a href="#addToAccountRegistry">addToAccountRegistry</a>
</li>
<li>
<span class="modifier">Public</span>
<span class="modifier">Async</span>
<a href="#haveAccount">haveAccount</a>
</li>
<li>
<span class="modifier">Public</span>
<span class="modifier">Async</span>
<a href="#last">last</a>
</li>
<li>
<span class="modifier">Public</span>
<span class="modifier">Async</span>
<a href="#totalAccounts">totalAccounts</a>
</li>
</ul>
</td>
</tr>
</tbody>
</table>
</section>
<section>
<h3 id="constructor">Constructor</h3>
<table class="table table-sm table-bordered">
<tbody>
<tr>
<td class="col-md-4">
<code>constructor(contractAddress: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/string" target="_blank">string</a>, signerAddress?: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/string" target="_blank">string</a>)</code>
</td>
</tr>
<tr>
<td class="col-md-4">
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<div class="io-line">Defined in <a href="" data-line="25" class="link-to-prism">src/app/_eth/accountIndex.ts:25</a></div>
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</td>
</tr>
<tr>
<td class="col-md-4">
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<div class="io-description"><p>Create a connection to the deployed account registry contract.</p>
</div>
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<div>
<b>Parameters :</b>
<table class="params">
<thead>
<tr>
<td>Name</td>
<td>Type</td>
<td>Optional</td>
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<td>Description</td>
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</tr>
</thead>
<tbody>
<tr>
<td>contractAddress</td>
<td>
<code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/string" target="_blank" >string</a></code>
</td>
<td>
No
</td>
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<td>
<code><ul>
<li>The deployed account registry contract&#39;s address.</li>
</ul>
</code>
</td>
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</tr>
<tr>
<td>signerAddress</td>
<td>
<code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/string" target="_blank" >string</a></code>
</td>
<td>
Yes
</td>
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<td>
<code><ul>
<li>The account address of the account that deployed the account registry contract.</li>
</ul>
</code>
</td>
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</tr>
</tbody>
</table>
</div>
</td>
</tr>
</tbody>
</table>
</section>
<section>
<h3 id="inputs">
Properties
</h3>
<table class="table table-sm table-bordered">
<tbody>
<tr>
<td class="col-md-4">
<a name="contract"></a>
<span class="name">
<b>
contract</b>
<a href="#contract"><span class="icon ion-ios-link"></span></a>
</span>
</td>
</tr>
<tr>
<td class="col-md-4">
<i>Type : </i> <code><a href="https://www.typescriptlang.org/docs/handbook/basic-types.html" target="_blank" >any</a></code>
</td>
</tr>
<tr>
<td class="col-md-4">
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<div class="io-line">Defined in <a href="" data-line="21" class="link-to-prism">src/app/_eth/accountIndex.ts:21</a></div>
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</td>
</tr>
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<tr>
<td class="col-md-4">
<div class="io-description"><p>The instance of the account registry contract. </p>
</div>
</td>
</tr>
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</tbody>
</table>
<table class="table table-sm table-bordered">
<tbody>
<tr>
<td class="col-md-4">
<a name="contractAddress"></a>
<span class="name">
<b>
contractAddress</b>
<a href="#contractAddress"><span class="icon ion-ios-link"></span></a>
</span>
</td>
</tr>
<tr>
<td class="col-md-4">
<i>Type : </i> <code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/string" target="_blank" >string</a></code>
</td>
</tr>
<tr>
<td class="col-md-4">
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<div class="io-line">Defined in <a href="" data-line="23" class="link-to-prism">src/app/_eth/accountIndex.ts:23</a></div>
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</td>
</tr>
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<tr>
<td class="col-md-4">
<div class="io-description"><p>The deployed account registry contract&#39;s address. </p>
</div>
</td>
</tr>
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</tbody>
</table>
<table class="table table-sm table-bordered">
<tbody>
<tr>
<td class="col-md-4">
<a name="signerAddress"></a>
<span class="name">
<b>
signerAddress</b>
<a href="#signerAddress"><span class="icon ion-ios-link"></span></a>
</span>
</td>
</tr>
<tr>
<td class="col-md-4">
<i>Type : </i> <code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/string" target="_blank" >string</a></code>
</td>
</tr>
<tr>
<td class="col-md-4">
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<div class="io-line">Defined in <a href="" data-line="25" class="link-to-prism">src/app/_eth/accountIndex.ts:25</a></div>
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</td>
</tr>
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<tr>
<td class="col-md-4">
<div class="io-description"><p>The account address of the account that deployed the account registry contract. </p>
</div>
</td>
</tr>
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</tbody>
</table>
</section>
<section>
<h3 id="methods">
Methods
</h3>
<table class="table table-sm table-bordered">
<tbody>
<tr>
<td class="col-md-4">
<a name="addToAccountRegistry"></a>
<span class="name">
<b>
<span class="modifier">Public</span>
<span class="modifier">Async</span>
addToAccountRegistry
</b>
<a href="#addToAccountRegistry"><span class="icon ion-ios-link"></span></a>
</span>
</td>
</tr>
<tr>
<td class="col-md-4">
<span class="modifier-icon icon ion-ios-reset"></span>
<code>addToAccountRegistry(address: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/string" target="_blank">string</a>)</code>
</td>
</tr>
<tr>
<td class="col-md-4">
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<div class="io-line">Defined in <a href="" data-line="57"
class="link-to-prism">src/app/_eth/accountIndex.ts:57</a></div>
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</td>
</tr>
<tr>
<td class="col-md-4">
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<div class="io-description"><p>Registers an account to the accounts registry.
Requires availability of the signer address.</p>
</div>
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<div class="io-description">
<b>Parameters :</b>
<table class="params">
<thead>
<tr>
<td>Name</td>
<td>Type</td>
<td>Optional</td>
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<td>Description</td>
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</tr>
</thead>
<tbody>
<tr>
<td>address</td>
<td>
<code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/string" target="_blank" >string</a></code>
</td>
<td>
No
</td>
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<td>
<ul>
<li>The account address to be registered to the accounts registry contract.</li>
</ul>
</td>
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</tr>
</tbody>
</table>
</div>
<div>
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<b>Example :</b>
<div>
<pre class="line-numbers"><code class="language-html">Prints &amp;quot;true&amp;quot; for registration of &amp;#39;0xc0ffee254729296a45a3885639AC7E10F9d54979&amp;#39;:&lt;/p&gt;
&lt;p&gt;```typescript&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;console.log(await addToAccountRegistry(&amp;#39;0xc0ffee254729296a45a3885639AC7E10F9d54979&amp;#39;));&lt;/li&gt;
&lt;li&gt;```&lt;/li&gt;
&lt;/ul&gt;</code></pre>
</div>
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</div>
<div class="io-description">
<b>Returns : </b> <code>Promise&lt;boolean&gt;</code>
</div>
<div class="io-description">
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<p>true - If registration is successful or account had already been registered.</p>
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</div>
</td>
</tr>
</tbody>
</table>
<table class="table table-sm table-bordered">
<tbody>
<tr>
<td class="col-md-4">
<a name="haveAccount"></a>
<span class="name">
<b>
<span class="modifier">Public</span>
<span class="modifier">Async</span>
haveAccount
</b>
<a href="#haveAccount"><span class="icon ion-ios-link"></span></a>
</span>
</td>
</tr>
<tr>
<td class="col-md-4">
<span class="modifier-icon icon ion-ios-reset"></span>
<code>haveAccount(address: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/string" target="_blank">string</a>)</code>
</td>
</tr>
<tr>
<td class="col-md-4">
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<div class="io-line">Defined in <a href="" data-line="78"
class="link-to-prism">src/app/_eth/accountIndex.ts:78</a></div>
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</td>
</tr>
<tr>
<td class="col-md-4">
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<div class="io-description"><p>Checks whether a specific account address has been registered in the accounts registry.
Returns &quot;true&quot; for available and &quot;false&quot; otherwise.</p>
</div>
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<div class="io-description">
<b>Parameters :</b>
<table class="params">
<thead>
<tr>
<td>Name</td>
<td>Type</td>
<td>Optional</td>
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<td>Description</td>
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</tr>
</thead>
<tbody>
<tr>
<td>address</td>
<td>
<code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/string" target="_blank" >string</a></code>
</td>
<td>
No
</td>
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<td>
<ul>
<li>The account address to be validated.</li>
</ul>
</td>
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</tr>
</tbody>
</table>
</div>
<div>
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<b>Example :</b>
<div>
<pre class="line-numbers"><code class="language-html">Prints &amp;quot;true&amp;quot; or &amp;quot;false&amp;quot; depending on whether &amp;#39;0xc0ffee254729296a45a3885639AC7E10F9d54979&amp;#39; has been registered:&lt;/p&gt;
&lt;p&gt;```typescript&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;console.log(await haveAccount(&amp;#39;0xc0ffee254729296a45a3885639AC7E10F9d54979&amp;#39;));&lt;/li&gt;
&lt;li&gt;```&lt;/li&gt;
&lt;/ul&gt;</code></pre>
</div>
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</div>
<div class="io-description">
<b>Returns : </b> <code>Promise&lt;boolean&gt;</code>
</div>
<div class="io-description">
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<p>true - If the address has been registered in the accounts registry.</p>
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</div>
</td>
</tr>
</tbody>
</table>
<table class="table table-sm table-bordered">
<tbody>
<tr>
<td class="col-md-4">
<a name="last"></a>
<span class="name">
<b>
<span class="modifier">Public</span>
<span class="modifier">Async</span>
last
</b>
<a href="#last"><span class="icon ion-ios-link"></span></a>
</span>
</td>
</tr>
<tr>
<td class="col-md-4">
<span class="modifier-icon icon ion-ios-reset"></span>
<code>last(numberOfAccounts: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/number" target="_blank">number</a>)</code>
</td>
</tr>
<tr>
<td class="col-md-4">
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<div class="io-line">Defined in <a href="" data-line="95"
class="link-to-prism">src/app/_eth/accountIndex.ts:95</a></div>
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</td>
</tr>
<tr>
<td class="col-md-4">
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<div class="io-description"><p>Returns a specified number of the most recently registered accounts.</p>
</div>
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<div class="io-description">
<b>Parameters :</b>
<table class="params">
<thead>
<tr>
<td>Name</td>
<td>Type</td>
<td>Optional</td>
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<td>Description</td>
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</tr>
</thead>
<tbody>
<tr>
<td>numberOfAccounts</td>
<td>
<code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/number" target="_blank" >number</a></code>
</td>
<td>
No
</td>
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<td>
<ul>
<li>The number of accounts to return from the accounts registry.</li>
</ul>
</td>
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</tr>
</tbody>
</table>
</div>
<div>
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<b>Example :</b>
<div>
<pre class="line-numbers"><code class="language-html">Prints an array of accounts:&lt;/p&gt;
&lt;p&gt;```typescript&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;console.log(await last(5));&lt;/li&gt;
&lt;li&gt;```&lt;/li&gt;
&lt;/ul&gt;</code></pre>
</div>
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</div>
<div class="io-description">
<b>Returns : </b> <code>Promise&lt;Array&lt;string&gt;&gt;</code>
</div>
<div class="io-description">
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<p>An array of registered account addresses.</p>
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</div>
</td>
</tr>
</tbody>
</table>
<table class="table table-sm table-bordered">
<tbody>
<tr>
<td class="col-md-4">
<a name="totalAccounts"></a>
<span class="name">
<b>
<span class="modifier">Public</span>
<span class="modifier">Async</span>
totalAccounts
</b>
<a href="#totalAccounts"><span class="icon ion-ios-link"></span></a>
</span>
</td>
</tr>
<tr>
<td class="col-md-4">
<span class="modifier-icon icon ion-ios-reset"></span>
<code>totalAccounts()</code>
</td>
</tr>
<tr>
<td class="col-md-4">
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<div class="io-line">Defined in <a href="" data-line="121"
class="link-to-prism">src/app/_eth/accountIndex.ts:121</a></div>
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</td>
</tr>
<tr>
<td class="col-md-4">
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<div class="io-description"><p>Returns the total number of accounts that have been registered in the network.</p>
</div>
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<div>
<b>Example :</b>
<div>
<pre class="line-numbers"><code class="language-html">Prints the total number of registered accounts:&lt;/p&gt;
&lt;p&gt;```typescript&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;console.log(await totalAccounts());&lt;/li&gt;
&lt;li&gt;```&lt;/li&gt;
&lt;/ul&gt;</code></pre>
</div>
</div>
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<div class="io-description">
<b>Returns : </b> <code>Promise&lt;number&gt;</code>
</div>
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<div class="io-description">
<p>The total number of registered accounts.</p>
</div>
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</td>
</tr>
</tbody>
</table>
</section>
</div>
<div class="tab-pane fade tab-source-code" id="c-source">
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<pre class="line-numbers compodoc-sourcecode"><code class="language-typescript">import Web3 from &#x27;web3&#x27;;
// Application imports
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import { environment } from &#x27;@src/environments/environment&#x27;;
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/** Fetch the account registry contract&#x27;s ABI. */
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const abi: Array&lt;any&gt; &#x3D; require(&#x27;@src/assets/js/block-sync/data/AccountRegistry.json&#x27;);
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/** Establish a connection to the blockchain network. */
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const web3: Web3 &#x3D; new Web3(environment.web3Provider);
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/**
* Provides an instance of the accounts registry contract.
* Allows querying of accounts that have been registered as valid accounts in the network.
*
* @remarks
* This is our interface to the accounts registry contract.
*/
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export class AccountIndex {
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/** The instance of the account registry contract. */
contract: any;
/** The deployed account registry contract&#x27;s address. */
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contractAddress: string;
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/** The account address of the account that deployed the account registry contract. */
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signerAddress: string;
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/**
* Create a connection to the deployed account registry contract.
*
* @param contractAddress - The deployed account registry contract&#x27;s address.
* @param signerAddress - The account address of the account that deployed the account registry contract.
*/
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constructor(contractAddress: string, signerAddress?: string) {
this.contractAddress &#x3D; contractAddress;
this.contract &#x3D; new web3.eth.Contract(abi, this.contractAddress);
if (signerAddress) {
this.signerAddress &#x3D; signerAddress;
} else {
this.signerAddress &#x3D; web3.eth.accounts[0];
}
}
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/**
* Registers an account to the accounts registry.
* Requires availability of the signer address.
*
* @async
* @example
* Prints &quot;true&quot; for registration of &#x27;0xc0ffee254729296a45a3885639AC7E10F9d54979&#x27;:
* &#x60;&#x60;&#x60;typescript
* console.log(await addToAccountRegistry(&#x27;0xc0ffee254729296a45a3885639AC7E10F9d54979&#x27;));
* &#x60;&#x60;&#x60;
*
* @param address - The account address to be registered to the accounts registry contract.
* @returns true - If registration is successful or account had already been registered.
*/
public async addToAccountRegistry(address: string): Promise&lt;boolean&gt; {
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if (!(await this.haveAccount(address))) {
return await this.contract.methods.add(address).send({ from: this.signerAddress });
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}
return true;
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}
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/**
* Checks whether a specific account address has been registered in the accounts registry.
* Returns &quot;true&quot; for available and &quot;false&quot; otherwise.
*
* @async
* @example
* Prints &quot;true&quot; or &quot;false&quot; depending on whether &#x27;0xc0ffee254729296a45a3885639AC7E10F9d54979&#x27; has been registered:
* &#x60;&#x60;&#x60;typescript
* console.log(await haveAccount(&#x27;0xc0ffee254729296a45a3885639AC7E10F9d54979&#x27;));
* &#x60;&#x60;&#x60;
*
* @param address - The account address to be validated.
* @returns true - If the address has been registered in the accounts registry.
*/
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public async haveAccount(address: string): Promise&lt;boolean&gt; {
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return (await this.contract.methods.accountIndex(address).call()) !&#x3D;&#x3D; 0;
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}
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/**
* Returns a specified number of the most recently registered accounts.
*
* @async
* @example
* Prints an array of accounts:
* &#x60;&#x60;&#x60;typescript
* console.log(await last(5));
* &#x60;&#x60;&#x60;
*
* @param numberOfAccounts - The number of accounts to return from the accounts registry.
* @returns An array of registered account addresses.
*/
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public async last(numberOfAccounts: number): Promise&lt;Array&lt;string&gt;&gt; {
const count: number &#x3D; await this.totalAccounts();
let lowest: number &#x3D; count - numberOfAccounts - 1;
if (lowest &lt; 0) {
lowest &#x3D; 0;
}
const accounts: Array&lt;string&gt; &#x3D; [];
for (let i &#x3D; count - 1; i &gt; lowest; i--) {
const account: string &#x3D; await this.contract.methods.accounts(i).call();
accounts.push(account);
}
return accounts;
}
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/**
* Returns the total number of accounts that have been registered in the network.
*
* @async
* @example
* Prints the total number of registered accounts:
* &#x60;&#x60;&#x60;typescript
* console.log(await totalAccounts());
* &#x60;&#x60;&#x60;
*
* @returns The total number of registered accounts.
*/
public async totalAccounts(): Promise&lt;number&gt; {
return await this.contract.methods.count().call();
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}
}
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