Loading collection data...
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.
Means the accumulator starts at 0.
This comment is hidden because it contains spoiler information about the solution
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/Reduce#Syntax
This comment is hidden because it contains spoiler information about the solution
Next time, mark your post as having spoiler content, please. console.log just prints the result to the console, it doesn't return anything, just remove it of your return line.