The JavaScript Set was introduced to the language in the ES2015 spec, but it has always seemed incomplete. That's about to change with the addition of functions like intersection, union and difference.
Why would you need to set up a postgres db…? Unions are a fundamental set theoretic operation that are applicable to all set-like collections. You may as well say “an in memory hash map / list is absurdly inefficient compared to a relational db.” Is it efficient, to you, to spin up a postgres instance to hold a dozen key value pairs?
Why would you need to set up a postgres db…? Unions are a fundamental set theoretic operation that are applicable to all set-like collections. You may as well say “an in memory hash map / list is absurdly inefficient compared to a relational db.” Is it efficient, to you, to spin up a postgres instance to hold a dozen key value pairs?