Undefined values: Difference between revisions

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m (Added the Sidef language)
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=={{header|Sidef}}==
=={{header|Sidef}}==
Sidef variables are initialized with a default ''nil'' value, which represent the absence of a value.
Sidef variables are initialized with a default ''nil'' value, representing the absence of a value.
<lang ruby>var x; # declared, but not defined
<lang ruby>var x; # declared, but not defined
x == nil && say "nil value";
x == nil && say "nil value";