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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.
Thank you for asking this great question!
And thank y'all for the responses!
Because, as it is indicated on the page given by B1ts, it's available from Node JS version 11, and this kata uses version 8.
check the aforementioned link; that method is not compliant will older versions of node
array.flat is a method in javascript and it works just fine in other platforms, so why the issue here?
See the node version required: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/flat
Why array.flat() is not a function in js ?
JS has this method and it work in any EDI and DevTools.