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. To specifically test is something is Null one can use the SameQ: |
Both set x to be Null. To specifically test is something is Null one can use the SameQ function (with infix operator: ===): |
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<lang Mathematica> |
<lang Mathematica> |
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SameQ[x,Null] |
SameQ[x,Null] |
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Or equivalent: |
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x===Null |
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</lang> |
</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. |
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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