Null object: Difference between revisions
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FullForm[x] |
FullForm[x] |
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</lang> |
</lang> |
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Both set x to be Null |
Both set x to be Null. To specifically test is something is Null one can use the SameQ: |
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<lang Mathematica> |
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However an object can also be 'empty' having nothing to it assigned (which is not equivalent to Null in Mathematica). |
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SameQ[x,Null]] |
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</lang> |
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will give back True if and only if x is assigned to be Null. If x is empty (nothing assigned) this will return False. |
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To test if an object has something assigned (number, list, graphics, null, infinity, symbol, equation, pattern, whatever) one uses ValueQ: |
To test if an object has something assigned (number, list, graphics, null, infinity, symbol, equation, pattern, whatever) one uses ValueQ: |
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<lang Mathematica> |
<lang Mathematica> |
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True |
True |
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</lang> |
</lang> |
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=={{header|MAXScript}}== |
=={{header|MAXScript}}== |
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