ruby - 如果在 Ruby 中将块作为参数传递 nil，它会运行吗？

Question

我在 ruby​​ 脚本中有以下块：

for line in allLines
    line.match(/aPattern/) { |matchData|
        # Do something with matchData
    }
end

如果/aPattern/与行中的任何内容都不匹配，该块还会运行吗？如果没有，有没有办法可以强制它运行？

Answer 1

The answer is no, the match block will not be run if the match does not suceed. However, for is generally not used in Ruby anyways, each is more idiomatic, like:

allLines.each do |line|
  if line =~ /aPattern/
    do_thing_with_last_match($~) ## $~ is last match
  else
    do_non_match_thing_with_line
  end
end

Note, =~ is a regex match operator.