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I don’t think Eric is saying “Use abstractions like map and create 10x value”. I think he’s saying “Create (really valuable) abstractions like map and create 10x value”. I think this is the next level you speak of. So to me, you are saying the same things.
Ehm, the Promise specification got into the language with ES6, async/await is there too— https://tc39.es/ecma262/#sec-async-function-definitions. The question “Is language X synchronous” does not sound coherent to me.
You can perform both sync and async operations in JS. While Promises are now part of the language…