ruby - 方法可变参数(如*options)之后的参数,不可以设置默认值吗?
伊谢尔伦
伊谢尔伦 2017-04-24 09:12:26
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譬如:

def calculate(*numbers, method = {:add=>true})

就一直报错:

syntax error, unexpected '=', expecting ')' (SyntaxError)

检索The Ruby Programming Wikibook 的相关语法也没有提示,请问这是什么原因呢?

伊谢尔伦
伊谢尔伦

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reply all(3)
黄舟

Suppose you are the interpreter, what would you do with calculate({add: true}) 中的参数 {add: true} 分配给 *numbers 呢,还是 method?

You can’t judge at all, right? So it's not allowed.

Peter_Zhu

Can’t this kind of *numbers variable parameters only be at the end?

def calc(method = {add: true}, *numbers); end is allowed, but the reverse is not allowed.

伊谢尔伦

Not allowed, there will be ambiguity

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