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Undefined values: Difference between revisions
→LOLCODE: Add demonstration
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show name? "n ; false
show :n ; n has no value</lang>
=={{header|LOLCODE}}==
LOLCODE's nil value is called <tt>NOOB</tt>, to which all uninitialized variables evaluate, and which is distinct from <tt>FAIL</tt>, the false value.
<lang LOLCODE>HAI 1.3
I HAS A foo BTW, INISHULIZD TO NOOB
DIFFRINT foo AN FAIL, O RLY?
YA RLY, VISIBLE "FAIL != NOOB"
OIC
I HAS A bar ITZ 42
bar, O RLY?
YA RLY, VISIBLE "bar IZ DEFIND"
OIC
bar R NOOB BTW, UNDEF bar
bar, O RLY?
YA RLY, VISIBLE "SHUD NEVAR C DIS"
OIC
KTHXBYE</lang>
=={{header|Lua}}==
<lang lua>print( a )
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