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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.
Because it's not necesary. "bool" is already a boolean, which means it can only have 2 possible values; true or false. The ternary operator (and the if statement) will validate if a value is "true" and only then execute the code.
https://softwareengineering.stackexchange.com/questions/136908/why-use-boolean-variable-over-boolean-variable-false