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Comment by artursapek | Hacker News Reader

This was the one thing I didn't understand. Why is using a global Symbol registry any better than just using string properties like usual?

There won't be a problem if the string happens to be e.g. "toString", I guess. Although they added a 'Map' for that, too.

    s1 = Symbol("cat");
    s2 = Symbol.for("cat");
    s3 = Symbol.for("cat");
    s1 == s2; // false
    s2 == s3; // true

You can still have Symbols outside the registry.

That I understand. What I don't understand is why s2 and s3 shouldn't just be vanilla strings.