Topic: how to swap two values in .net? for example int a, int b, how to swap the value of them? @枫下论坛 The Rolia Forum

工作学习 / 学科技术 / how to swap two values in .net? for example int a, int b, how to swap the value of them? -binghongcha76(一只大猫); 2022-3-18 {103} (#14451430@0)
老方法是借助一个临时变量 c
C# 7以后引入了一个新的语法
(a,b) = (b,a);
ya easy..

Any use cases of switching values of two variables? -sailor(Ocean & Mountain); 2022-3-18 (#14451564@0)

好问题，吃饱了撑的😂而且不管你表面怎么简化，机器内部还是要通过第三个变量去做，整数之类的小东西没啥，物体数列之类的大东西最好写在面上，省得被忽略。 -piglet(小猪); 2022-3-19 (#14451572@0)

I don't remember that I ever needed to do such switching. -sailor(Ocean & Mountain); 2022-3-19 (#14451574@0)

刷题时天天 swap two variables lol -xmlhttprequest(build5381); 2022-3-19 (#14451585@0)
很常见啊。比如quicksort里就需要用到 -iamflying(叶和花); 2022-3-19 (#14451586@0)

如果加减不溢出，可以不需要临时变量： -iamflying(叶和花); 2022-3-19 {42} (#14451588@0)
a += b
b = a - b
a -= b

不好。不易懂，难维护。主贴的意思是将来的编程应该这样: swap(a,b) -big-foot-is-a-joke(big-foot-is-a-joke); 2022-3-19 (#14451682@0)
a,b的type不一定是int，可以是任意 T a, T b, (a,b)=(b,a) 是 Tuple<>的一个语法糖 -binghongcha76(一只大猫); 2022-3-19 (#14451749@0)

在 js 里通过 destructuring expression，看上去很类似，不过 js array destructuring 超实用... 个人觉得 c# / es6+ 是最简练，最优雅的... 不过c#最近的版本有一些 features 有点为语法糖而语法糖了... -xmlhttprequest(build5381); 2022-3-19 {810} (#14451760@0)
The destructuring assignment syntax is a JavaScript expression that makes it possible to unpack values from arrays, or properties from objects, into distinct variables.
Full Story:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment

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