在 nil 的情况下分配替代值 [英] Assigning a substitute value in case of nil

问题描述

我有几个变量:

name
age
address
phone
social_security
email
weight

还有一个名为 personal_details 的数组，其中每个值都位于位置 0-6.

And an array called personal_details with each of these values in positions 0-6.

所以我分配这样的值:

name = personal_details[0]
address = personal_details[1]
phone = personal_details[2]
social_security = personal_details[3]
email = personal_details[4]
weight = personal_details[5]

但是，在某些情况下，右侧的数据不存在.

In some cases, however, the data on the right hand side does not exist.

有什么比为数组中的每个元素编写这样的代码更优雅的处理方式?

if !personal_detail[0].nil?
 name = personal_details[0]
else
 name = ""
end
if !personal_detail[1].nil?
 address = personal_details[1]
else
 address = ""
end

推荐答案

您可以这样做，因为 nil 值返回 false 并且 || 只会评估正确的 -如果左侧为假，则为手侧:

You could do this since a nil value returns false and || will only evaluate the right-hand side if the left-hand side is false:

name = personal_details[0] || ''

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