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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.
yup, but works only on arrays and objects if I remember correctly.
let a = +"123"; // 123
let a = Number("123"); // 123
To convert to a number explicitly, you can call Number(val), or, in short, put a unary plus "+" before the expression
This kata already wants you to find an answer and then copy it 4 more times for some reason. Maybe this guy just likes typing.