Null object: Difference between revisions
added Fantom example
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=={{header|Factor}}==
<lang factor>: is-f? ( obj -- ? ) f = ;</lang>
=={{header|Fantom}}==
Test for equality with 'null', which is the null value.
<lang fantom>
fansh> x := null
fansh> x == null
true
fansh> x = 1
1
fansh> x == null
false
</lang>
Note, nullable objects have a type ending in a question mark, for example:
<code>Int? y := null</code> is valid, but
<code>Int y := null</code> is not.
=={{header|Forth}}==
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