It's something that someone else wrote or maybe you wrote, but you can encapsulate all of your ideas or your functionality inside this thing called a function.

它是别人或你自己写的，但是你可以压缩你所有的想法，或者你这个东西里面的功能叫做一个函数。

youdao

These service components can be implemented in a variety of ways, as new functionality or based on existing function.

可以通过各种各样的方式实现这些服务组件，可以将它们实现为新功能或基于现有的功能。

youdao

Tests can be categorized according to the amount of code they exercise: a unit test verifies the functionality of a single software component, such as a function or a class.

可以将测试按照测试代码的多少分类：“单元测试”检验单一组件的功能，比如一个函数或者一个类。

youdao

It's something that someone else wrote or maybe you wrote, but you can encapsulate all of your ideas or your functionality inside this thing called a function.

它是别人或你自己写的，但是你可以压缩你所有的想法,或者你这个东西里面的功能叫做一个函数。

哈佛公开课 - 计算机科学课程节选