ruby – 命名Class.new

为什么为Class.new分配名称/常量会以这种方式运行？

c = Class.new #=> <Class:0xnnnnnnn>
puts c  #=> <Class:0xnnnnnnn>

b = c
puts b #=> <Class:0xnnnnnnn>

NewClass = c   #=> NewClass  <shouldn't it be same as above #=> <Class:0xnnnnnnn>
puts c  #=> NewClass  <and Now c has a name although it was not the left operand above>

解决方法

后者等同于使用kernel :: const_set

语义类NewClass相当于

c = Class.new
Kernel::const_set :NewClass,c

并赋值给一个常量,即NewClass = c在语义上等价于

Kernel::const_set :NewClass,c

所以当你写作

c = Class.new
NewClass = c

它在语义上和写作一样

class NewClass