What is the built-in operator for set union on lists?

[Robert Goldman]

It seems to be missing from Table 3 in the Ergo Manual.

Thanks!

[Robert Goldman]

Actually, maybe ++ is the set union operator, but in that case, what's the append operator?

[Michael Kifer]

In table 3, the mention of set union was a mistake. But some operations that treat lists as sets are provided in that section.

However, there is also  section

50.6   Sets, Maps, and Dictionaries

where  is describes a package that is more complicated than lists, but it provides much more efficient set data structs and maps.

-- michael

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