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As shown below, my autofill in Mathematica showed an interesting function: DispatchQ. Yet, it does not appear in the Mathematica Documentation Center, a search for DispatchQ on the Mathematica Stack Exchange comes up with nothing, and even a Google search for "DispatchQ" reveals nothing I can see relating to Mathematica (though there is a link to a 1915 document from the New York Supreme Court).

Does anyone know what it is and why it isn't documented?

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    $\begingroup$ Returns True if applied to a Dispatch object. $\endgroup$ – ciao Jun 26 '20 at 23:48
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    $\begingroup$ @ciao Thanks. Do you know why it isn't documented? $\endgroup$ – Just Some Old Man Jun 27 '20 at 9:19
  • $\begingroup$ I presume it just falls into the group of internally used utility functions - there's a lot of undocumented stuff. Beats me on the details, and the usual cautions about using undocumented stuff applies (it may disappear, etc). $\endgroup$ – ciao Jun 27 '20 at 18:03
  • $\begingroup$ @ciao Do you know if undocumented functions usually come up on the auto fill? I don’t recall seeing that before. $\endgroup$ – Just Some Old Man Jun 27 '20 at 23:52
  • $\begingroup$ I guess it's an internal function used by /. for distinguishing rule lists and Dispatches. $\endgroup$ – SneezeFor16Min Jun 28 '20 at 7:31

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