Help us understand the problem. What is going on with this article?

戻り値でbinding.pryを使うとnilを返してしまう。

More than 1 year has passed since last update.

デバッグツールとして便利なbinding.pry
しかし、デバッグをしている間にハマってしまった。

デバッグ中に勘違いしてしまったこと

def toal
  total = sum #<= 2ではなくnilが返る
  puts total
end 

def sum
  1 + 1
  binding.pry
end

total
nil

通常、sumの戻り値は2のはずだが、binding.pryで確かめた後だと、nilが返ってきてしまう。

これによって、正常に値が渡らないのはなぜだ?と何時間も悩むハメに。。

便利なツールだが、メソッドの一番後ろにかけると勘違いを引き起こしてしまう可能性があるので今後使う際は気をつけていきたい。

Why not register and get more from Qiita?
  1. We will deliver articles that match you
    By following users and tags, you can catch up information on technical fields that you are interested in as a whole
  2. you can read useful information later efficiently
    By "stocking" the articles you like, you can search right away
Comments
No comments
Sign up for free and join this conversation.
If you already have a Qiita account
Why do not you register as a user and use Qiita more conveniently?
You need to log in to use this function. Qiita can be used more conveniently after logging in.
You seem to be reading articles frequently this month. Qiita can be used more conveniently after logging in.
  1. We will deliver articles that match you
    By following users and tags, you can catch up information on technical fields that you are interested in as a whole
  2. you can read useful information later efficiently
    By "stocking" the articles you like, you can search right away
ユーザーは見つかりませんでした