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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.
If you call variable as a stack you should use .unshift instead of push. Because stack involves the principle of first came, the latter came out.
not enought good because two loops instead of one. One loop is enought (use
deleteinstead of= 1and then get the only object field).