Null object: Difference between revisions
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With the SYMBOL built-in function, it can be determined if a variable is defined (or not). |
With the SYMBOL built-in function, it can be determined if a variable is defined (or not). |
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The LENGTH built-in function can be used to see what the length of the value of a |
The LENGTH built-in function can be used to see what the length of the value of a defined variable. |
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A variable with a NULL value has a length of 0 (zero). |
A variable with a NULL value has a length of 0 (zero). |
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