在两次调用一个函数以及将返回值存储在变量之间选择哪个? [英] which one to choose between calling a function twice and storing the return value in a variable?

问题描述

我有以下情况..我多次遇到类似情况.以下两个选项中哪一个更可取?

I have the following scenario.. and I come across the similar scenario many a times. Which is more preferable of the following two options?

选项1:

String result = ( getDetails(...) == null ) ? "" : getDetails(...);

选项2:

String returnValue = getDetails(...);
String result = ( returnValue == null ) ? "" : returnValue;

哪个更可取和/或更好的做法??

Which is more preferable and/or a good practice.?

推荐答案

选项2:更好

Option-1:会导致额外的方法调用，并且应始终避免此类情况，除非getDetails(...)是一种吸气剂方法(一种返回某些内容的线性方法)

Option-1: Results in extra method call and such cases should always be avoided unless getDetails(...) is a getter method (a one liner method which returns something)

如果您深入研究微优化，通常会导致方法调用

If you dig down to micro optimization, a method call generally results in

• 方法变量的堆栈分配
• 跳过指令集

这是许多间接费用中的几个. 很多人说，这种性能优化应该留给编译器和代码应该写得更具可读性.

which are couple of many overheads. As many say, such performance optimization should be left to Compiler and the code should be written to be more readable.

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