Ruby:initialize() 与类体? [英] Ruby: initialize() vs class body?

问题描述

在 Ruby 中，将代码放在 initialize() 方法中而不是直接放在类体中有什么区别?两者似乎在调用 MyClass.new 时都被执行.

In Ruby, what is the difference between putting code in an initialize() method rather than directly in the class body? Both appear to be executed when calling MyClass.new.

显然，initialize() 可以接受参数，但仅此而已吗?

Clearly, initialize() can accept parameters, but is that the only difference?

class MyClass
  puts 'Hello'

  def initialize(params)
    puts 'World'
  end
end

推荐答案

尝试创建 MyClass 的两个实例

Try to create two instances of MyClass

a = MyClass.new
b = MyClass.new

看看区别:

你好

世界

世界

类体中的代码只执行一次 - 当 ruby​​ 加载文件时.initialize() 每次创建类的新实例时都会执行.

Code in the class body execute only once - when ruby loads the file. initialize() executes every time you create a new instance of your class.

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