The author gets a few names wrong. "The length of an array can be determined through the length variable of the array object[...]". `length` is a property and n

The author gets a few names wrong. "The length of an array can be determined through the length variable of the array object[...]". `length` is a property and not a variable, otherwise it would be writable with the suggested semantics of changing the length. They also use a for-loop with a counting variable instead of the iterator pattern. The latter might be preferable because the array index is not actually important for that example. Otherwise the article is fine for beginners.