====== IsBoolean(expression) ======
Category:  Logical function

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=====Description=====
This function returns TRUE if the result of //expression// is a Boolean (either TRUE or FALSE).  Otherwise, it returns FALSE.

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=====Arguments=====
^Argument^Type^Description^
|expression|Expression|Any expression that could potentially result a Boolean value.|
**Return value type:** Boolean (TRUE/FALSE)

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=====Examples=====

  isboolean( [FieldA] = 200 )  //Returns TRUE if [FieldA] is 200

  isboolean( [FieldA] - 199 )  //Returns FALSE (Expression is a calculation.  The result would be a numeric value.)

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===== See also =====
  * [[syntax:functions:isempty|IsEmpty(expression)]]
  * [[syntax:functions:iserror|IsError(expression)]]
  * [[syntax:functions:isinteger|IsInteger(expression)]]
  * [[syntax:functions:isnumber|IsNumber(expression)]]
  * [[syntax:functions:isnumeric|IsNumeric(expression)]]
  * [[syntax:functions:istext|IsText(expression)]]