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(→‎Insitux: implementation)
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<syntaxhighlight lang="idl">result = array[where(NOT array AND 1)]</syntaxhighlight>
<syntaxhighlight lang="idl">result = array[where(NOT array AND 1)]</syntaxhighlight>

=={{header|Insitux}}==
<syntaxhighlight lang="insitux">> (filter even? [0 1 2 3 4])
[0 2 4]

> (var x [0 1 2 3 4])
[0 1 2 3 4]

> (var! x (filter even?)) ;replaces variable x by applying implicit closure
[0 2 4]
</syntaxhighlight>


=={{header|J}}==
=={{header|J}}==