The difference lies in using in scalar context (as -n does in the second script) or list context (as the first script does).

区别在于在标量上下文中的使用(如第二个脚本中使用- n)或在列表上下文中的使用(如第一个脚本所做的)。

youdao

If a callback does not require arguments, we do not need to create the anonymous list, since Perl treats scalar values, evaluated in list context, as single-element arrays.

如果回调不需要参数，则我们不需要创建那个匿名列表，因为Perl按单元素数组来处理列表上下文中计算得到的数量值。

youdao

To do this we create an information context list from the XML fragment.

为此，我们从这个xml片段创建一个信息上下文列表。

youdao

Tom Hutton, a spokesman for the university, said the list had been taken out of context.

CNN: College women told to urinate or vomit to deter a rapist

"With Girdwood what we had in front of us was a unique opportunity to make some sort of dent on the waiting list and to see it in the context of an overall very good and positive development for the city as a whole in terms of economic regeneration, social use, leisure and of course housing, " he said.

BBC: Nelson McCausland vetoes Girdwood social homes

Part of the education process must focus on risks, and a short list recapping some serious breaches should help put those risks in context.

FORBES: Off-the-Books Cloud Projects: How to Find Them and What to Do About Them