谁能解释这个数组声明对我？ [英] Can anyone explain this array declaration to me?

问题描述

只是想知道最后一个逗号的presence之间的差异在阵列中，如果有任何可言

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]

第二个数组仍然有效，也不例外引发

The second array still works, no exception raised

感谢

推荐答案

有什么区别。在Ruby中，你可以自由地尾随逗号添加到一个数组。它使语法如下：

There's no difference. In Ruby, you're free to add a trailing comma to an array. It makes syntax like this:

a = [
  1,
  2,
  3,
]

有一个更好一点，在某些情况下（例如，如果要添加元素，只需添加一个 4 线，不必担心检查对于最后一行逗号分隔）。

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).

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