ruby 创建符号数组
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Create array of symbols
提问by Drew
Is there a cleaner way to do something like this?
有没有更干净的方法来做这样的事情？
%w[address city state postal country].map(&:to_sym)
#=> [:address, :city, :state, :postal, :country]
I would have figured %swould have done what I wanted, but it doesn't. It just takes everything between the brackets and makes one big symbol out of it.
我本以为%s会做我想做的事，但事实并非如此。它只需要括号之间的所有内容，并从中生成一个大符号。
Just a minor annoyance.
只是一个小烦恼。
回答by Joost Baaij
The original answer was written back in September '11, but, starting from Ruby 2.0, there is a shorter way to create an array of symbols! This literal:
最初的答案是在 11 年 9 月写的，但是，从 Ruby 2.0 开始，有一种更短的方法来创建符号数组！这个字面意思：
%i[address city state postal country]
will do exactly what you want.
会做你想做的。
回答by Joost Baaij
With a risk of becoming too literal, I think the cleanest way to construct an array of symbols is using an array of symbols.
有变得过于文字化的风险，我认为构造符号数组的最简洁方法是使用符号数组。
fields = [:address, :city, :state, :postal, :country]
Can't think of anything more concise than that.
想不出比这更简洁的了。
回答by askrynnikov
%i[ ]Non-interpolated Array of symbols, separated by whitespace (after Ruby 2.0)
%i[ ]非内插符号数组，由空格分隔（Ruby 2.0 之后）
%I[ ]Interpolated Array of symbols, separated by whitespace (after Ruby 2.0)
%I[ ]插入的符号数组，由空格分隔（在 Ruby 2.0 之后）
%i[address city state postal country]
%i[address city state postal country]
the cleanest way to do this is:
最干净的方法是：
%w[address city state postal country].map(&:to_sym)
%w[address city state postal country].map(&:to_sym)
