Javascript how to use the and/or operator with parenthesis

Question

I have an object that contains a string HelloWorld in the attribute hello. I want to check for two strings, and if it does not match with either one, then I want to execute certain code.

var item = { hello: "HelloWorld" }
item.hello !== "HelloWorld" && item.hello !== "GoodbyeWorld" // false, correct

However, I feel this can be optimized and made more readable:

item.hello !== ("GoodbyeWorld" && "HelloWorld") // false, correct
item.hello !== ("HelloWorld" && "GoodbyeWorld") // true   WTF?

I expected both checks to be falsy, but surely I'm missing something here. I think I do not have a correct understanding of the AND/OR operator in javascript, or I am using the parenthesis in a wrong manner. Can anyone explain?

JSFiddle example

Answer 1

The result of "HelloWorld" && "GoodbyeWorld" is "GoodbyeWorld" which is why you're getting the result you are, the previous way you were doing it is the simplest solution