您是否可以缩短某个变量可能是多个事物的"if"语句 [英] Can you shorten an 'if' statement where a certain variable could be multiple things

问题描述

由于我有时需要if语句，如

Since I sometimes needs an if-statement like

if (variable == 'one' || variable == 'two' || variable == 'three') { 
    // code
}

我想知道您是否可以写得更短一些，例如:

I was wondering if you could write this any shorter, something like:

if (variable == ('one' || 'two' || 'three')) {
    // code
}

推荐答案

或..

if (~['one', 'two', 'three'].indexOf(variable))

任何有很多方法可以剥皮的猫

any cat with many ways to skin it

~是按位非 ... ...因此-1变为0，0变为-1，1变为-2，依此类推

~ is bitwise NOT ... so -1 becomes 0, 0 becomes -1, 1 becomes -2 and so on

所以...当indexOf为0或更大时，即indexOf为真"，即...的值...

so ... ~ with indexOf is "truthy" when indexOf is 0 or greater, i.e. value is found ...

基本上，这是一条捷径，我可能不会在预期会被其他人阅读的代码中使用，因为一半以上的人会挠头并想知道代码做了什么:p

basically it's a shortcut that I probably wouldn't use in code expected to be read by other people as over half would scratch their heads and wonder what the code did :p

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