Null object: Difference between revisions
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=={{header|J}}==
J doesn't have NULL. To indicate "missing data", "normal" data is usually pressed into service (e.g. <tt>0</tt> or <tt>_1</tt> in a numeric context, <tt>' '</tt> in a literal context, <tt>a:</tt> in a boxed context, etc).
However, undefined names in J can be identified:
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