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Is there a summary for all Function like
NumberQ, LetterQ and so forth?

data=123;
IntegerQ[data]

True
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marked as duplicate by rm -rf Mar 7 '13 at 14:58

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1 Answer

Do you mean a list of functions ending in Q?

?*Q

shot

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(+1) or ?*`*Q to get all 1243 functions. –  kguler Mar 7 '13 at 13:55
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There is an example like this in the documentation page on Information. Typing "?" in help is useless :( (it does not bring you to Information). Also the syntax is so special that you cannot do something like Hold[?*Q]//FullForm to find out what function is being used. So I figured I'd post this. –  Jacob Akkerboom Mar 7 '13 at 14:11
    
Of course, not all of these are querying functions. EllipticNomeQ[], LegendreQ[], and MarcumQ[] are examples that spring to mind. –  J. M. Apr 16 '13 at 13:24
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