March 2019
Intermediate to advanced
208 pages
5h 11m
English
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Using map, keep, and reduce with Lists
Before we get started on this section, you might be having a slight case of déjà vu—haven’t we already covered map in the discussion of option? Yes and no. The plain truth is that the word map occurs in a large number of contexts in functional programming. Almost any time you find a construct that’s even remotely like the mathematical idea of a function mapping a domain onto a range, sure enough, someone has slapped the term map onto it. The map in this section isn’t the same as the one you saw before, and—fair warning—it’s not the last time you’ll see that term pop up in this book.
Now that we’ve done the housekeeping and laundry, it’s time to use list functions to process the data in a list. Consider ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.