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264 webMathematica User GuideMSPValueMSPValue@varDreturns the value of var; it returns a null string if var has no valueMSPValue@var, def Dreturns the value of var; it returns def if var has no valueMORE INFORMATION† MSPValue is a utility function that is useful for extracting the value of variables.† The following exceptions can be thrown by MSPValue.MSPException@" ValueError "DMSPException@" VariableError "Dif the value is not a string, this indicates a programmatic errorby the page authorif the variable is not a Mathematica symbol, this indicates aprogrammatic error by the page authorEXAMPLESBasic Examples (1)You can simulate how the functions work by loading the package.The value of the variable $$expr is returned.In[1]:= $$expr = 56; MSPValue@ $$exprDOut[1]= 56If $$expr has no value, then a null string is returned.In[2]:=Clear@$$exprD; MSPValue@ $$exprDOut[2]=