编写此速记条件三元运算符以比较两个变量的正确方法是什么？

Question

I'm having trouble figuring out how to write a shorthand conditional statement. Here's an example of the code:

const siteIdentifier = "bar";
const refOne = "foo";
const refTwo = "bar";

(siteIdentifier == refOne || refTwo) ? "primary" : "secondary";

I've also tried using .match and other variations but was unsuccessful with that as well.

I'm looking to compare the siteIdentifier string to two possible strings. If the strings match, we're returning "primary" . If it doesn't match one of the two, it returns "secondary" .

Answer 1

one way would be

(siteIdentifier == refOne || siteIdentifier == refTwo) ? "primary" : "secondary";

... another one could be (more useful when you have many strings to match to)

~[refOne, refTwo].indexOf(siteIdentifier) ? "primary" : "secondary";

which is the same as

[refOne, refTwo].indexOf(siteIdentifier) >= 0 ? "primary" : "secondary";

Answer 2

尝试这个 ：

(siteIdentifier == refOne) ? "primary" : (siteIdentifier == refTwo ? "primary" : "secondary");

Answer 3

Just for the completeness, an object with all possibillities together.

const obj = { foo: 'primary', bar: 'primary', default: 'secondary'};
x = obj[siteIdentifier] || obj.default;