`Symbol.for` uses a global registry and the whole thing is "stringly typed". Loo...

artursapek · on June 12, 2015

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?

Ded7xSEoPKYNsDd · on June 12, 2015

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.

towelguy · on June 12, 2015

    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.

artursapek · on June 14, 2015

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