Ruby:Object.to_a 替换 [英] Ruby: Object.to_a replacement

问题描述

我需要将传入的参数(单个对象或集合)转换为数组.我不知道论据是什么.如果它已经是一个数组，我想离开它，否则从它创建一个单元素数组.我希望 同时允许 method(:objs => obj) 和 method(:objs => [obj1, obj2])

I need to convert a passed in argument (single object or collection) to an Array. I don't know what the argument is. If it is an Array already, I want to leave it, otherwise create a one-element array from it. I'm looking to allow both method(:objs => obj) and method(:objs => [obj1, obj2])

这似乎是最好的方法(Array#to_a 返回 self):

This seems to be the best way (Array#to_a returns self):

arg = arg.to_a

但是 ruby​​ 文档说Object#to_a 很快就会过时.有方便更换吗?

But the ruby docs say Object#to_a will soon be obsolete. Is there convenient replacement?

还有比这更简洁的吗?

arg = arg.respond_to?(:to_a) ? arg.to_a : [arg]

推荐答案

使用方法 内核#Array:

Array([1,2,3]) #=> [1, 2, 3]
Array(123) #=> [123]

是的，一开始它可能看起来像一个类，但这实际上是一个以大写字母开头的方法.

Yes it may look like a class at first but this is actually a method that starts with a capital letter.

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