@array = grep !defined || $_ ne 'hello', @array;

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The grep built-in function takes a list (in this case supplied by @array) and returns only those elements of the list for which the BLOCK or EXPRESSION of the function evaluates true. In this case, the expression is
    !defined || $_ ne 'hello'
and only elements of the input list that are either not defined or not string-equal to 'hello' are output. A better name for the  grep function might be 'filter'.

In reply to Re^5: How can I delete an element in a foreach cycle? by AnomalousMonk
in thread How can I delete an element in a foreach cycle? by saintex

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