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面试准备

Ruby On Rails 面试题与答案

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问题 61. What is an object?

Textbook answer here is that an object is an instance of a class and has state, behavior, and identity. In a plain text example, you can say that a truck and a car are both objects of the class Vehicle, or that apple and pear are both objects of the class Fruit.

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问题 62. How would you declare and use a constructor in Ruby?

Constructors are declared via the initialize method and get called when you call on a new object to be created.

Using the code snippet below, calling Order.new acts as a constructor for an object of the class Order.

class Order

def initialize(customer, meal, beverage)

@customer = customer

@meal = meal

@beverage = beverage

end

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问题 63. How does a symbol differ from a string?

Symbols are immutable and reusable, retaining the same object_id.

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问题 64. How and when would you declare a Global Variable?

Global variables are declared with the ‘$’ symbol and can be declared and used anywhere within your program. You should use them sparingly to never.

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问题 65. How would you create getter and setter methods in Ruby?

Setter and getter methods in Ruby are generated with the attr_accessor method. attr_accessor is used to generate instance variables for data that’s not stored in your database column.

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