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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.
let is identical to var.
The only difference is,
var is scoped to the 'nearest function block' and let is scoped to the 'nearest enclosing block'
for eg. let is only visible in the for() loop and var is visible to the whole function.