Ruby if .. elsIf .. else在一行上吗? [英] Ruby if .. elsIf .. else on a single line?

问题描述

使用ruby三元运算符，我们可以为简单的if else构造编写以下逻辑:

With the ruby ternary operator we can write the following logic for a simple if else construct:

a = true  ? 'a' : 'b' #=> "a"

但是如果我想将其写为if foo 'a' elsif bar 'b' else 'c'怎么办?

But what if I wanted to write this as if foo 'a' elsif bar 'b' else 'c'?

我可以将其编写为以下内容，但很难遵循:

I could write it as the following, but it's a little difficult to follow:

foo = true
a = foo  ? 'a' : (bar ? 'b' : 'c') #=> "a"

foo = false
bar = true
a = foo  ? 'a' : (bar ? 'b' : 'c') #=> "b"

是否有更好的选择来处理这种情况?或者如果我们希望将if..elif..else逻辑压缩为一行，这是我们最好的选择吗?

Are there any better options for handling such a scenario or is this our best bet if we wish to condense if..elsif..else logic into a single line?

推荐答案

a = (foo && "a" or bar && "b" or "c")

或

a = ("a" if foo) || ("b" if bar) || "c"

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