谁能给我解释一下这个数组声明吗？
只是想知道数组中最后一个逗号是否存在之间的区别（如果有的话）
>> [1,2,3]
=> [1, 2, 3]
>> [1,2,3,]
=> [1, 2, 3]
第二个数组仍然有效，没有引发异常
谢谢
just wondering the difference between the presence of the last comma in the array, if there is any at all
>> [1,2,3]
=> [1, 2, 3]
>> [1,2,3,]
=> [1, 2, 3]
The second array still works, no exception raised
Thanks
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评论（3）
没有什么区别。在 Ruby 中，您可以自由地向数组添加尾随逗号。它使语法如下：
在某些情况下更好一点（例如，如果您想添加一个元素，您只需添加一个
4,行，而不必担心检查逗号在最后一行）。There's no difference. In Ruby, you're free to add a trailing comma to an array. It makes syntax like this:
A bit nicer, in some cases (e.g., if you want to add an element, you simply add a
4,line and don't have to worry about checking for a comma on the last line).这不是一个错误，只是一个空值（被编译器忽略），但我建议您阅读 了解 Ruby 数组
It isn't a error, just a empty value(ignored by the compiler), but I suggest you to read Understanding Ruby Arrays
数组没有什么特别的。
相同，
所以值只是方法调用参数。这同样适用于
which 与 is 相同
方法调用参数中允许使用尾随逗号的原因只是因为 Ruby 就是这样设计的，出于
@mipadi提到的方便原因。There is nothing special about arrays.
is the same as
so the values are just method call parameters. The same applies to
which is the same as
And the reason trailing commas are allowed in method-call parameters is just because Ruby is designed like that, for the reasons of convenience that
@mipadimentioned.