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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.
I really don't understand this: const stringToNumber = str => ways.map(fn => fn(str)).reduce(checkThemAll)
fn has to be a function with the parentheses, hasn't it?
num % 10: to becom the last digit. Why 10? Because it concerns the decimal numbers which are represented from 0 to 9, so 10.
/ 10: to the next digit
We have to understand, there are various number systems, but the commun ones are: decimal (basis 10), binary (basis 2), octal (basis 8), Hexa (basis 16)