MSPValue

MSPValue[var]

returns the value of var, returning a null string if var has no value.

MSPValue[var,def]

returns the value of var, returning def if var has no value.

Details

MSPValue is a utility function that is useful for extracting the value of variables.
The following exceptions can be thrown by MSPValue:

	MSPException["ValueError"]	if the value is not a string; this indicates a programmatic error by the page author
	MSPException["VariableError"]	if the variable is not a Wolfram Language symbol; this indicates a programmatic error by the page author

You can simulate how the functions work by loading the package.

The value of the variable $$expr is returned:

If $$expr has no value, then a null string is returned:

Here, a default value is returned:

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