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Interesting substring
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Fundamentals
Strings
Arrays
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JS version update
Returning inconsistent datatypes is not a best practice. How about
["",-1]if there are no interesting substrings?Also, use valid input and appropriate datatypes. Why give us a space-separated string when you can give us an array of strings? Every solution starts by splitting on whitespace and lowercasing everything ( not necessarily in that order ), but neither of these is the essence of the task.
As mentioned below, needs random tests.
Random tests needed.
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