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A value that indicates that no beginning value has been assigned to a variable. Empty variables are 0 in a numeric context, or zero-length in a string context.
Error number
A whole number in the range 0 to 65,535, inclusive, that corresponds to the Number property of the Err object. When combined with the Name property of the Err object, this number represents a particular error message.
A combination of keywords, operators, variables, and constants that yield a string, number, or object. An expression can perform a calculation, manipulate characters, or test data.
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