jruby-是ruby lambda语法->不是重要的考虑因素吗? [英] jruby - is ruby lambda syntax -> not an important consideration?

问题描述

我注意到，即使最新的1.6.4 jruby版本也不支持Ruby 1.9中的新lambda语法->.因此，我猜想这种语法在ruby社区中并不常用.是因为语法是新的还是有其他缺点?

I noticed that new lambda syntax -> in Ruby 1.9 is not supported even in the latest 1.6.4 jruby release. So, I am guessing this syntax is not commonly used in the ruby community. Is it because the syntax is new or are there any other disadvantages?

x = -> y { y+1 }
x.call(2)

这在ruby 1.9.1中返回3，并在jruby 1.6.4中给出语法错误

This returns 3 in ruby 1.9.1 and gives a syntax error in jruby 1.6.4

推荐答案

您未在1.9模式下运行它.

You are not running it in 1.9 mode.

$ jruby --1.9 -S irb
irb(main):001:0> x = -> y { y+1 }
=> #<Proc:0x1e937f@(irb):1 (lambda)>
irb(main):002:0> x.call(2)
=> 3

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