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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.
You're confusing which tests you failed. Also read about Equality comparisons and sameness
proper syntax is != not !==
(one equals sign after '!')
At first, I write the if statement as 'if (val !== true)'.
But I got errors in case of 'val == null' and 'val == undefined' despite they are falsy as well.
Anybody could tell me why this cases happen??