126 lines
6.3 KiB
HTML
126 lines
6.3 KiB
HTML
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<title> How to read signatures - Mithril.js</title>
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<header>
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<a class="hamburger" href="javascript:;">≡</a>
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<h1><img src="logo.svg"> Mithril <small>2.0.0-rc.5</small></h1>
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<a href="index.html">Guide</a>
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<main>
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<section>
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<h1 id="how-to-read-signatures"><a href="#how-to-read-signatures">How to read signatures</a></h1>
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<ul>
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<li>Core<ul>
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<li><a href="hyperscript.html">m</a></li>
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<li><a href="render.html">m.render</a></li>
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<li><a href="mount.html">m.mount</a></li>
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<li><a href="route.html">m.route</a></li>
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<li><a href="request.html">m.request</a></li>
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<li><a href="jsonp.html">m.jsonp</a></li>
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<li><a href="parseQueryString.html">m.parseQueryString</a></li>
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<li><a href="buildQueryString.html">m.buildQueryString</a></li>
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<li><a href="trust.html">m.trust</a></li>
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<li><a href="fragment.html">m.fragment</a></li>
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<li><a href="redraw.html">m.redraw</a></li>
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<li><a href="version.html">m.version</a></li>
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<li><a href="promise.html">Promise</a></li>
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</ul>
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</li>
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<li>Optional<ul>
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<li><a href="stream.html">Stream</a></li>
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</ul>
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</li>
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<li>Tooling<ul>
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<li><a href="https://github.com/MithrilJS/mithril.js/blob/master/ospec">Ospec</a></li>
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</ul>
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</li>
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</ul>
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<p>Signature sections typically look like this:</p>
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<p><code>vnode = m(selector, attributes, children)</code></p>
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<table>
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<thead>
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<tr>
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<th>Argument</th>
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<th>Type</th>
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<th>Required</th>
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<th>Description</th>
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</tr>
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</thead>
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<tbody><tr>
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<td><code>selector</code></td>
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<td><code>String|Object</code></td>
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<td>Yes</td>
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<td>A CSS selector or a component</td>
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</tr>
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<tr>
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<td><code>attributes</code></td>
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<td><code>Object</code></td>
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<td>No</td>
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<td>HTML attributes or element properties</td>
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</tr>
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<tr>
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<td><code>children</code></td>
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<td><code>Array<Vnode>|String|Number|Boolean</code></td>
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<td>No</td>
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<td>Child <a href="vnodes.html">vnodes</a>. Can be written as <a href="signatures.html#splats">splat arguments</a></td>
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</tr>
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<tr>
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<td><strong>returns</strong></td>
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<td><code>Vnode</code></td>
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<td></td>
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<td>A <a href="vnodes.html">vnode</a></td>
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</tr>
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</tbody></table>
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<p>The signature line above the table indicates the general syntax of the method, showing the name of the method, the order of its arguments and a suggested variable name for its return value.</p>
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<p>The <strong>Argument</strong> column in the table indicates which part of the signature is explained by the respective table row. The <code>returns</code> row displays information about the return value of the method.</p>
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<p>The <strong>Type</strong> column indicates the expected type for the argument.</p>
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<p>A pipe (<code>|</code>) indicates that an argument is valid if it has any of the listed types. For example, <code>String|Object</code> indicates that <code>selector</code> can be a string OR an object.</p>
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<p>Angled brackets (<code>< ></code>) after an <code>Array</code> indicate the expected type for array items. For exampe, <code>Array<String></code> indicates that the argument must be an array and that all items in that array must be strings. Angled brackets after an <code>Object</code> indicate a map. For example, <code>Object<String,Component></code> indicates that the argument must be an object, whose keys are strings and values are <a href="components.html">components</a></p>
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<p>Sometimes non-native types may appear to indicate that a specific object signature is required. For example, <code>Vnode</code> is an object that has a <a href="vnodes.html">virtual DOM node</a> structure.</p>
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<p>The <strong>Required</strong> column indicates whether an argument is required or optional. If an argument is optional, you may set it to <code>null</code> or <code>undefined</code>, or omit it altogether, such that the next argument appears in its place.</p>
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<hr>
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<h3 id="optional-arguments"><a href="#optional-arguments">Optional arguments</a></h3>
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<p>Function arguments surrounded by square brackets <code>[ ]</code> are optional. In the example below, <code>url</code> is an optional argument:</p>
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<p><code>m.request([url,] options)</code></p>
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<hr>
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<h3 id="splats"><a href="#splats">Splats</a></h3>
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<p>A splat argument means that if the argument is an array, you can omit the square brackets and have a variable number of arguments in the method instead.</p>
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<p>In the example at the top, this means that <code>m("div", {id: "foo"}, ["a", "b", "c"])</code> can also be written as <code>m("div", {id: "foo"}, "a", "b", "c")</code>.</p>
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<p>Splats are useful in some compile-to-js languages such as Coffeescript, and also allow helpful shorthands for some common use cases.</p>
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<hr>
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<h3 id="function-signatures"><a href="#function-signatures">Function signatures</a></h3>
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<p>Functions are denoted with an arrow (<code>-></code>). The left side of the arrow indicates the types of the input arguments and the right side indicates the type for the return value.</p>
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<p>For example, <code>parseFloat</code> has the signature <code>String -> Number</code>, i.e. it takes a string as input and returns a number as output.</p>
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<p>Functions with multiple arguments are denoted with parenthesis: <code>(String, Array) -> Number</code></p>
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<hr />
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<small>License: MIT. © Leo Horie.</small>
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</section>
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