Javascript square brackets around method name

Question

In the RxJs doc I found following code snippet:

[rxSubscriberSymbol]() {
    return new SubjectSubscriber(this);
}

Its part of the Subject source code and is the first method right after the constructor.

So what do square brackets mean in this context?

https://stackoverflow.com/questions/34831262/what-do-square-brackets-around-a-property-name-in-an-object-literal-mean - that refers to object literals, but [the same principal applies for class properties](http://2ality.com/2015/09/function-names-es6.html#methods-in-class-definitions) apparently. — CodingIntrigue, Jan 25 '18 at 12:45

score 5 · Accepted Answer · answered Jan 25 '18 at 12:24

those are symbols, which is very similar to defining properties but gives different accessibility and testability functionality and they are completely unique,

you can read a lot more about metaprogramming here, Metaprogramming in ES6: Symbols and why they're awesome

Javascript square brackets around method name

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