The answer
Because the braces are interpreted as a block body, not an object literal. Wrapping the object in parentheses (n) => ({ x: 1 }) makes it an expression body that returns the object.
How JavaScript Functions Return Values
Why does an arrow function with an object literal need parentheses?
More FAQs in How JavaScript Functions Return Values
undefined. If a function has no return, or a return with no expression, it returns undefined to the caller.
It evaluates the return expression, hands the value to the caller, and immediately pops the current frame from the call stack. Code after return in the function body is not executed.
Yes. A function that returns another function is a higher-order function. The returned function keeps a reference to the outer variable environment, creating a closure.
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