Go defer的红宝石当量是多少？

Question

I am a new to Ruby and I am working on a project which involves using this. Go offers the defer statement, and I wanted to know how I could replicate that function in ruby.

Example:

dst, err := os.Create(dstName)
if err != nil {
    return
}
defer dst.Close()

Answer 1

There are no proper equivalents to the defer statement in ruby, however if you want to make sure that a specific code block is executed, you can use the ensure statement. The difference is that you cannot stack code blocks like defer does, but the result is the same.

In a block

begin
  # ...
ensure
  # This code will be executed even if an exception is thrown
end

In a method

def foo
  # ...
ensure
  # ...
end

Object#ensure Marks the final, optional clause of a begin/end block, generally in cases where the block also contains a rescue clause. The code in the ensure clause is guaranteed to be executed, whether control flows to the rescue block or not.