Comment by Leszek

FWIW, I think the parent meant "function scoping vs lexical scoping" rather than "block scoping vs lexical scoping". You're correct that function scoping is technically a form of lexical scoping (where the scope is the function), but if you want to be _really_ pedantic, the ecma262 considers let/const to be "lexical binding"[0] as opposed to var being a "variable declaration"[1], where the former declares in the "Lexical Environment" while the latter declares in the "Variable Environment". These happen to be the same environment record on function entry.

[0] https://tc39.es/ecma262/#sec-let-and-const-declarations [1] https://tc39.es/ecma262/#sec-variable-statement