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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
It works for the test array because the elements are ordered highest to lowest already.
Your function won't work if numbers[i] is lower than high1, but higher than high2.
console.log()ing the numbers array and high1&2 as they are assigned might help clarify this.