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The for ...in statement iterates over the enumerable properties of an object.
(enumerable : able to be counted by one-to-one correspondence with the set of all positive integers.)
The for ...of statement iterates over values that the iterable object defines to be iterated over.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...of
for...of - JavaScript | MDN
The for...of statement creates a loop iterating over iterable objects, including: built-in String, Array, array-like objects (e.g., arguments or NodeList), TypedArray, Map, Set, and user-defined iterables. It invokes a custom iteration hook with statements
developer.mozilla.org
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