从Ruby中的字符串中删除最后2个字符？
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Remove the last 2 characters from a string in Ruby?
提问by Tom Lehman
I'm collecting all my user's email addresses for a mass mailing like this:
我正在收集我所有用户的电子邮件地址，以便进行这样的群发邮件：
def self.all_email_addresses
output = ''
User.all.each{|u| output += u.email + ", " }
output
end
However, I end up with an extra ", " on the string of email addresses.
但是，我最终在电子邮件地址字符串中得到了一个额外的“,”。
How can I get rid of this / is there a better way to get a comma separated list of email addresses?
我怎样才能摆脱这个/是否有更好的方法来获取逗号分隔的电子邮件地址列表？
回答by DigitalRoss
remove the last two characters
删除最后两个字符
str.chop.chop # ...or...
str[0..-3]
Although this does answer the exact question, I agree that it isn't the best way to solve the problem.
虽然这确实回答了确切的问题，但我同意这不是解决问题的最佳方法。
回答by giorgian
Use join:
使用连接：
def self.all_email_addresses
User.all.collect {|u| u.email}.join ', '
end
回答by onyxrev
Or just "yadayada"[0..-3] will do it.
或者只是 "yadayada"[0..-3] 就可以了。
