You probably haven't got the data structure you think you have. What I think you mean is:

my @a = ('a', 'b', 'c', 'd');
#or my @a = qw( a b c d );
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To delete the array element containing 'c', see grep:

@a = grep { $_ ne 'c' } @a;
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Update Further to Corion's (and others) advice

• If you know the index of the element you want to delete, use splice
• If you know the contents of the element you want to delete, use grep