那就是说，如果函数有确定的有效值集合或范围可作为参数，可以将检验参数是否有效的断言放在该函数代码的第一行。

That is, if a function has a certain set or range of valid values for its arguments, an assertion to this effect can be placed as the first line of code in the function.

youdao

当处理规则表达式时，将它作为它自己的编程问题来处理，即使只涉及一或两行代码；这些行有效地构成了一个小程序。

When approaching a regular expression, treat it as its own programming problem, even though only one or two lines of code may be involved; those lines effectively form a small program.

youdao

软件包的代码行增加了，但是没有为新代码编写相应的测试（或者是新增加的测试不能有效地覆盖新代码）。

The package grew in terms of lines of code, but no corresponding tests were written for the new code (or that newly added tests do not effectively cover the new code).

youdao