in reply to using map

By "push" do you mean that @digits already contains some data, and you want to append some extra stuff (digits) to it? If so...

push @digits, map { /[0-9]/ ? $_ : () } @list

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But better than map would be grep.

push @digits, grep { /[0-9]/ } @list;

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perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'

In Section Seekers of Perl Wisdom