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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.
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Neat, isn't it? ;-)
d>''<b
is a double thumbs-up!
@cahyareza
if x < len(s) - 1
is the same as:
if len(s) - x > 1
meaning that the cursor (
x
) has to be before (<
) the last position (len(s) - 1
), in other words at the penultimate position at most, and in this case you want a slice of 2 (s[x:x+2]
);otherwise, if your cursor is at the last position, you want the last character plus an underscore (
s[-1] + "_"
).You are safe since you're stepping 2 by 2 (
in range(0, len(s), >>2<<)
).Also remember that positions start with 0, so each one is "position - 1" (the first one is "1 - 1 = 0", the second one is "2 - 1 = 1", ..., hence the last one is
len(s) - 1
).I actually love this one as it fits better in a functional programming mindset.