除首字母大写外、用小写字母打印并排序所有环境变量的多行循环。

A multi-line loop to print all the environment variables in lowercase, with the first letter uppercase, and sorted.

youdao

除首字母大写外、用小写字母打印并排序所有环境变量的单行循环。

A one-line loop to print all the environment variables in lowercase, with the first letter uppercase, and sorted.

youdao

使用map，并且除首字母大写外、以小写字母打印并排序所有环境变量的单行循环。

A one-line loop to print all the environment variables in lowercase, with the first letter uppercase, and sorted, using map.

youdao