Iterating over array of strings produces error

Question

I pass in an array of error messages to parse. An example input would be:

\"An item with this x Id already exists.
 An item with this y id already exists.
 An it         


        

Answer 1

Never loop over an array with for...in.

Iterates over the enumerable properties of an object, in arbitrary order.

Why is using "for...in" with array iteration a bad idea?