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WithoutBook LIVE 模拟面试 Ruby On Rails 相关面试主题: 20

面试题与答案

了解热门 Ruby On Rails 面试题与答案，帮助应届生和有经验的候选人为求职面试做好准备。

共 74 道题 面试题与答案

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了解热门 Ruby On Rails 面试题与答案，帮助应届生和有经验的候选人为求职面试做好准备。

面试题与答案

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中级 / 1 到 5 年经验级别面试题与答案

问题 1

Explain the difference between a has_one and belongs_to association in Ruby on Rails.

has_one: Indicates a direct 1:1 relationship between objects where each instance of a model contains one instance of another model.
A product has_one provider, a customer has_one order.


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问题 2

What is a Proc?

Procs, short for procedures, act similar to blocks, but can be saved as variables and reused. Think of them as blocks you can call over and over again on multiple arrays.
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问题 3

What are the three levels of method access control for classes and what do they signify? What do they imply about the method?

  • Public, protected, and private.

  • Public methods can be called by all objects and subclasses of the class in which they are defined in.

  • Protected methods are only accessible to objects within the same class.

  • Private methods are only accessible within the same instance.

  • Be able to explain why this does (or doesn’t matter), and when you would want to set a method as private.
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问题 4

What is the convention using ‘!’ at the end of method name?

The ! indicates that the method is about to change the object itself.

Here’s an example:

foo = "A TEST STRING"  # a string called foo

foo.downcase!     # modifies foo permanently
a test string

puts foo          # prints modified foo
a test string

Similarly if you did not want the object to be changed you could have something simple like:

foo2 = "A 2nd Test String"  # a string called foo 

foo2.downcase     # modifies foo temporarily
a 2nd test string 

puts foo2 nbsp;    # prints original foo 
A 2nd Test String
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