What's the output?

function sayHi() {
  return (() => 0)();
}

console.log(typeof sayHi());

You missed this one before

The sayHi function returns the returned value of the immediately invoked function expression (IIFE). This function returned 0, which is type "number".

FYI: typeof can return the following list of values: undefined, boolean, number, bigint, string, symbol, function and object. Note that typeof null returns "object".

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