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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.
I'm not adding the method indexOfProp after I use it, the code I have written are definitions of the function
highestAgeand the methodindexOfPropfor the Array object. So when it comes to run the code the methodindexOfPropis defined.