Ruby：打印和整理数组的方法
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Ruby: method to print and neat an array
提问by Manza
I am not sure if this question is too silly but I haven't found a way to do it.
我不确定这个问题是否太愚蠢，但我还没有找到解决办法。
Usually to puts an array in a loop I do this
通常将数组放入循环中，我这样做
current_humans = [.....]
current_humans.each do |characteristic|
puts characteristic
end
However if I have this:
但是，如果我有这个：
class Human
attr_accessor:name,:country,:sex
@@current_humans = []
def self.current_humans
@@current_humans
end
def self.print
#@@current_humans.each do |characteristic|
# puts characteristic
#end
return @@current_humans.to_s
end
def initialize(name='',country='',sex='')
@name = name
@country = country
@sex = sex
@@current_humans << self #everytime it is save or initialize it save all the data into an array
puts "A new human has been instantiated"
end
end
jhon = Human.new('Jhon','American','M')
mary = Human.new('Mary','German','F')
puts Human.print
It doesn't work.
它不起作用。
Of course I can use something like this
当然我可以使用这样的东西
puts Human.current_humans.inspect
but I want to learn other alternatives!
但我想学习其他选择！
回答by Simone Carletti
You can use the method p. Using pis actually equivalent of using puts+ inspecton an object.
您可以使用该方法p。Usingp实际上相当于在对象上使用puts+ inspect。
humans = %w( foo bar baz )
p humans
# => ["foo", "bar", "baz"]
puts humans.inspect
# => ["foo", "bar", "baz"]
But keep in mind pis more a debugging tool, it should not be used for printing records in the normal workflow.
但请记住p，它更像是一个调试工具，不应用于正常工作流程中的打印记录。
There is also pp(pretty print), but you need to require it first.
还有pp（漂亮的印刷品），但你需要先要求它。
require 'pp'
pp %w( foo bar baz )
ppworks better with complex objects.
pp处理复杂的对象效果更好。
As a side note, don't use explicit return
作为旁注，不要使用显式返回
def self.print
return @@current_humans.to_s
end
should be
应该
def self.print
@@current_humans.to_s
end
And use 2-chars indentation, not 4.
并使用 2 个字符的缩进，而不是 4 个。
