But when you pass a parameter say, a list, you didn't think that you were not only passing the list, you were also passing the functions that operate on the list. In fact you are.

你不会认为你输入的不仅仅是链表，你还传递了处理链表的函数,实际上你正是这么做的,这往往不重要。

麻省理工公开课 - 计算机科学及编程导论课程节选