帮助重构这个讨厌的 Ruby if/else 语句 [英] Help refactoring this nasty Ruby if/else statement
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问题描述
所以我有这个大而多毛的 if/else 语句.我向它传递一个跟踪号,然后它确定它是什么类型的跟踪号.
So I have this big, hairy if/else statement. I pass a tracking number to it, and then it determines what type of tracking number it is.
我怎样才能简化这件事?特别想减少代码行数.
How can I simplify this thing? Specifically wanting to reduce the number of lines of codes.
if num_length < 8
tracking_service = false
else
if number[1, 1] == 'Z'
tracking_service = 'ups'
elsif number[0, 1] == 'Q'
tracking_service = 'dhl'
elsif number[0, 2] == '96' && num_length == 22
tracking_service = 'fedex'
elsif number[0, 1] == 'H' && num_length == 11
tracking_service = 'ups'
elsif number[0, 1] == 'K' && num_length == 11
tracking_service = 'ups'
elsif num_length == 18 || num_length == 20
check_response(number)
else
case num_length
when 17
tracking_service = 'dhlgm'
when 13,20,22,30
tracking_service = 'usps'
when 12,15,19
tracking_service = 'fedex'
when 10,11
tracking_service = 'dhl'
else
tracking_service = false
end
end
end
是的,我知道.真恶心.
Yes, I know. It's nasty.
推荐答案
试试这个.我使用 case
和正则表达式重写了它.我还使用 :symbols
而不是 "strings"
作为返回值,但您可以将其改回来.
Try this. I rewrote it using case
and regular expressions. I also used :symbols
instead of "strings"
for the return values, but you can change that back.
tracking_service = case number
when /^.Z/ then :ups
when /^Q/ then :dhl
when /^96.{20}$/ then :fedex
when /^[HK].{10}$/ then :ups
else
check_response(number) if num_length == 18 || num_length == 20
case num_length
when 17 then :dhlgm
when 13, 20, 22, 30 then :usps
when 12, 15, 19 then :fedex
when 10, 11 then :dhl
else false
end
end
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