I haven't seen a solution with "grep" yet, which feels natural to me for this problem:
sub insert_after_first {
my ($arr, $find, $insert) = @_;
my $found = 0;
my ($pos) = grep { $arr->[$_] eq $find and !$found++ } 0..$#$arr;
splice @$arr, $pos+1, 0, $insert if $found;
}
Update: A shorter, slightly neater variant:
sub insert_after_first {
my ($arr, $find, $insert) = @_;
my ($pos) = grep { $arr->[$_] eq $find } 0..$#$arr;
splice @$arr, $pos+1, 0, $insert if defined($pos);
}
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