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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.
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validParentheses('(1)') return false
Hi,
Please note that the comments you write under solutions are visible through any user's dashboard, so think about using the spoiler flag when you give away most of the solution or critical information.
Cheers
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Recursive function
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wierdo
You can use int.tryParse(String source, {int? radix}) to return null in case of FormatException.