ment 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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<h3 id="optional-arguments"><a href="#optional-arguments">Optional arguments</a></h3>
<p>Function arguments surrounded by square brackets <code>[ ]</code> are optional. In the example below, <code>url</code> is an optional argument:</p>
<p><code>m.request([url,] options)</code></p>
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<h3 id="splats"><a hr