保理/重构程序 [英] Factoring/Refactoring a program

问题描述

不好的因子和重构这个术语是什么意思？

What does the term 'poorly factored' and 'refactoring' a program mean? Can you give a simple example to understand the basic difference ?

推荐答案

重构是一种可以引用许多任务的通用技术。

Refactoring is a general technique that can refer to many tasks. It usually means cleaning up code, removing redundancy, improving code quality and readability.

这是一个非常简单的例子：

A very simple example of poorly factored code:

do_task1("abc");
do_task2(123);
do_task3(7.43);
...
//100 lines later:
do_task1("abc");
do_task2(123);
do_task3(7.43);
...
//80 lines later:
do_task1("abc");
do_task2(123);
do_task3(7.43);

查看同一组3行是如何重复重复的？

See how the same set of 3 lines is repeated over and over and over?

重构此代码可能会得到：

Refactoring this code might give:

procedure do_tasks1to3(x,y,z)
    do_task1(x);
    do_task2(y);
    do_task3(z);
end

do_tasks1to3("abc",123,7.43);
...
//100 lines later:
do_tasks1to3("abc",123,7.43);
...
//80 lines later:
do_tasks1to3("abc",123,7.43);

重构代码使用一个过程来执行重复任务，如果 do_task4 需要添加，它只需要在过程中完成，而不是像以前一样在4个单独的位置。

The refactored code makes use of a procedure to perform the repetitive tasks, and if a do_task4 ever needs to be added, it only needs to be done inside the procedure, not in 4 separate places like before.

是重构这个的其他方法，当然如果你需要有变化的 do_taskn 函数这可能不工作，但这通常是如何开始.. 。

There are other ways to refactor this, and of course if you ever needed to have variance to the do_taskn functions this might not work, but this is usually how you'd start...

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