我如何使用Ruby的新lambda语法？

Ruby有lambda语法，所以我可以使用->符号：

 a = 0 new -> { a < 5 } do puts a a += 1 end 

这非常有效，但是当我尝试这样做时：

 match "/", to: -> { |e| [404, {}, ["Hello! I am micro rack app"]] }, via: [:get] match( "/", to: -> { |e| [404, {}, ["Hello! I am micro rack app"]] }, via: [:get] ) match( "/", { to: -> { |e| [404, {}, ["Hello! I am micro rack app"]] }, via: [:get] }) 

所有返回相同的语法错误：

 $ ruby -c -e 'match( "/", to: -> { |e| [404, {}, ["Hello! I am micro rack app"]] }, via: [:get] )' -e:1: syntax error, unexpected '|' match( "/", to: -> { |e| [404, {}, ["Hello! I am mi... 

我错过了什么吗？

Answer 1

我认为新的语法应该是

 match "/", to: ->(e) { [404, {}, ["Hello! I am micro rack app"]] }, via: [:get] 

Answer 2

我认为语法应该是这样的。

 ->(e) { [404, {}, ["Hello! I am micro rack app"]] 

Answer 3

看来你正在混合->和lambda语法

 match( "/", to: lambda { |e| [404, {}, ["Hello! I am micro rack app"]] }, via: [:get] ) 

和

 match( "/", to: -> (e) { [404, {}, ["Hello! I am micro rack app"]] }, via: [:get] ) 

就个人而言，我会使用’lambda’语法，因为它更加ruby。