The skip variable was set to "(empty string), so all input, including Spaces, goes to the token directive."

skip变量设置为' '(空字符串)，所以所有输入(包括空格)都转至标志伪指令。

youdao

This implies that the vast majority of strings-including most non-empty strings-will evaluate as being false. A typical mistake is to test for an empty string like so.

这意味着大部分字符串—包括大部分非空字符串—将被计算为false。

youdao