node-red/nodes/core/core/80-function.html

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        <label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
        <input type="text" id="node-input-name" placeholder="Name">
    </div>
    <div class="form-row" style="margin-bottom: 0px;">
        <label for="node-input-func"><i class="fa fa-wrench"></i> Function</label>
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        <input type="hidden" id="node-input-valid">
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<script type="text/x-red" data-help-name="function">
    <p>A function block where you can write code to do more interesting things.</p>
    <p>The message is passed in as a JavaScript object called <code>msg</code>.</p>
    <p>By convention it will have a <code>msg.payload</code> property containing
       the body of the message.</p>
    <p>If your node need to log anything use the <code>node</code> object:
        <ul>
            <li>Info: <code>node.log(msg);</code></li>
            <li>Warning: <code>node.warn(msg);</code></li>
            <li>Error: <code>node.error(msg);</code></li>
        </ul>
    </p>
    <p>The function should return the messages it wants to pass on to the next nodes
    in the flow. It can return:</p>
    <ul>
      <li>a single message object - passed to nodes connected to the first output</li>
      <li>an array of message objects - passed to nodes connected to the corresponding outputs</li>
    </ul>
    <p>If any element of the array is itself an array of messages, multiple
          messages are sent to the corresponding output.</p>
    <p>If null is returned, either by itself or as an element of the array, no
          message is passed on.</p>
    <p>See the <a target="_new" href="http://nodered.org/docs/writing-functions.html">online documentation</a> for more help.</p>

</script>

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