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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.
+y do it (convert string to an integer). but take (+y) into bracket, it'll work whithout errors.
x isn't string , it's "accumulator" and start from initialValue = 0. You can read here https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/Reduce
x and y parameters are strings isn't it? So we must convert them to an integer before calculation.
are someone can someone help me to understand what happened??!
how do you find my answer, is it nice?