Groovy没有收藏(Groovy not in collection)

Groovy没有收藏(Groovy not in collection)

查看列表中是否有东西的常规方式是使用“in”

if('b' in ['a','b','c'])

然而，你如何很好地看到某件物品是否不在收藏品中？

if(!('g' in ['a','b','c']))

似乎凌乱和“！” 隐藏在随便的一瞥中。 有没有更习惯性的常规方式来做到这一点？

谢谢！

The groovy way to see if something is in a list is to use "in"

if('b' in ['a','b','c'])

However how do you nicely see if something is not in a collection?

if(!('g' in ['a','b','c']))

Seems messy and the "!" is hidden to the casual glance. Is there a more idiomatic groovy way to do this?

Thanks!

最满意答案

不幸的是，我认为没有很好的语法。 但是你可以使用一个辅助变量来使其更具可读性：

def isMagicChar = ch in ['a', 'b', 'c'] if (!isMagicChar) ...

或者，在这种情况下，你可以使用正则表达式:)

if (ch !=~ /[abc]/) ...

I think there is no not in pretty syntax, unfortunately. But you can use a helper variable to make it more readable:

def isMagicChar = ch in ['a', 'b', 'c'] if (!isMagicChar) ...

Or, in this case, you may use a regex :)

if (ch !=~ /[abc]/) ...