本文介绍了ruby中tap方法的优点的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我刚刚阅读了一篇博客文章，并注意到作者在如下片段中使用了 tap:
I was just reading a blog article and noticed that the author used tap in a snippet something like:
user = User.new.tap do |u|
u.username = "foobar"
u.save!
end
我的问题是使用 tap 到底有什么好处或优势?我不能做:
My question is what exactly is the benefit or advantage of using tap? Couldn't I just do:
user = User.new
user.username = "foobar"
user.save!
或者更好:
user = User.create! username: "foobar"
推荐答案
当读者遇到:
user = User.new
user.username = "foobar"
user.save!
他们必须遵循所有三行，然后才能认识到它只是在创建一个名为 user 的实例.
they would have to follow all the three lines and then recognize that it is just creating an instance named user.
如果是:
user = User.new.tap do |u|
u.username = "foobar"
u.save!
end
那么马上就清楚了.阅读器不必阅读块内的内容即可知道实例 user 已创建.
then that would be immediately clear. A reader would not have to read what is inside the block to know that an instance user is created.
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