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Introduction
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keyring
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trie-db
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trie-hash
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<li class="chapter active" data-level="1.5" data-path="./">
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util
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<li class="chapter " data-level="1.6" data-path="../util-crypto/">
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util-crypto
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Keyring
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Create Account
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Load Accounts
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<li class="chapter " data-level="2.2" data-path="../examples/util-crypto/">
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<a href="../examples/util-crypto/">
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Util-Crypto
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<ul class="articles">
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<li class="chapter " data-level="2.2.1" data-path="../examples/util-crypto/01_encrypt_decrypt_message_nacl/">
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<a href="../examples/util-crypto/01_encrypt_decrypt_message_nacl/">
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Encrypt & Decrypt Message
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</li>
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<li class="chapter " data-level="2.2.2" data-path="../examples/util-crypto/02_sign_verify_message_nacl/">
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<a href="../examples/util-crypto/02_sign_verify_message_nacl/">
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Sign & Verify Message
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</li>
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<li class="chapter " data-level="2.2.3" data-path="../examples/util-crypto/03_mnemonic_generate_validate_bip39/">
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<a href="../examples/util-crypto/03_mnemonic_generate_validate_bip39/">
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Create & Validate Mnemonic
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<!-- Title -->
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<h1>
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<a href=".." >util</a>
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</h1>
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<section class="normal markdown-section">
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<h1 id="polkadotutil">@polkadot/util</h1>
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<p>Various useful utility functions that are used across all projects in the <a href="https://polkadot.js.org" target="_blank">@polkadot</a> namespace. It provides utility functions with additional safety checks, allowing not only for consistent coding, but also reducing the general boilerplate.</p>
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<h2 id="usage">Usage</h2>
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<p>Installation -</p>
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<pre><code>yarn add @polkadot/util
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</code></pre><p>Functions can be imported directly from the package, e.g.</p>
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<pre><code class="lang-js"><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-reservedWord">import</span> <span class="sunlight-punctuation">{</span> <span class="sunlight-ident">isHex</span> <span class="sunlight-punctuation">}</span> <span class="sunlight-ident">from</span> <span class="sunlight-string">'@polkadot/util'</span><span class="sunlight-punctuation">;</span>
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</span></pre></div></div></code></pre>
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<h2 id="documentation-and-available-utilities">Documentation and Available Utilities</h2>
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<p>Below is a list of currently exposed methods published at the <a href="https://polkadot.js.org/common/util/" target="_blank">Polkadot-JS Common Documentation Portal</a>.</p>
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<p>Utility methods for this package are split into groups, some of which are included in the list below:</p>
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<ul>
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<li><a href="https://polkadot.js.org/common/util/README.md" target="_blank">util</a><ul>
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<li>Classes<ul>
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<li><a href="https://polkadot.js.org/common/util/classes/_ext_error_.exterror.md" target="_blank">Error</a></li>
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</ul>
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</li>
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<li>Functions<ul>
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<li><a href="https://polkadot.js.org/common/util/modules/_array_filter_.md" target="_blank">arrayFilter</a></li>
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<li><a href="https://polkadot.js.org/common/util/modules/_assert_.md" target="_blank">assert</a></li>
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<li><a href="https://polkadot.js.org/common/util/modules/_logger_.md" target="_blank">logger</a></li>
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<li><a href="https://polkadot.js.org/common/util/modules/_promisify_.md" target="_blank">promisify</a></li>
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<li><a href="https://polkadot.js.org/common/util/modules/_syncify_.md" target="_blank">syncify</a></li>
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</ul>
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</li>
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</ul>
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</li>
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</ul>
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<p>Below is information about some of the available methods:</p>
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<h3 id="assert">Assert</h3>
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<ul>
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<li>Checks for a valid test, if not <code>ExtError</code> is thrown</li>
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</ul>
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<h3 id="logger">Logger</h3>
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<ul>
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<li>Creates a consistent log interface for messages that has <code>.log</code>, <code>.error</code>, <code>.warn</code> and <code>.debug</code> (controlled with environment <code>DEBUG=typeA,typeB</code>) methods.</li>
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</ul>
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<h3 id="promisify">Promisify</h3>
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<ul>
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<li>Wraps a supplied asynchronous callback function into a Promise, passing supplied parameters. When <code>error</code> is set, the Promise is rejected, else the Promise resolves with the <code>result</code> value.</li>
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</ul>
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<h3 id="syncify">Syncify</h3>
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<ul>
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<li>This is currently for Node environments only.</li>
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</ul>
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