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Merge pull request #2649 from natcl/patch-5
Clarify empty rules in switch node documentation
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<h4>Notes</h4>
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<p>The <code>is true/false</code> and <code>is null</code> rules perform strict
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comparisons against those types. They do not convert between types.</p>
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<p>The <code>is empty</code> rule passes for Strings, Arrays and Buffers that have
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a length of 0, or Objects that have no properties. It does not pass for <code>null</code>
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or <code>undefined</code> values.</p>
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<p>The <code>is empty</code> and <code>is not empty</code> rules can be used to test the length of Strings, Arrays and Buffers, or the number of properties an Object has. Neither rule will pass if the property being tested has a <code>boolean</code>, <code>null</code>
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or <code>undefined</code> value.</p>
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<h4>Handling message sequences</h4>
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<p>By default, the node does not modify the <code>msg.parts</code> property of messages
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that are part of a sequence.</p>
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