July 2023
Intermediate to advanced
670 pages
17h 13m
English
Content preview from Effective Haskell
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Exercises
Undefined
Consider a function that takes three integers but hasn’t been defined:
| | addThree :: Int -> Int -> Int -> Int |
There are several different ways that you could write a function like this. For example, here are two possible definitions:
| | -- definition 1 |
| | addThree = undefined |
| | |
| | -- definition 2 |
| | addThree a b c = undefined |
There are many other ways we could use undefined to write a version of addThree that type checks. Why are there so many different versions?
Understanding Functions by Their Type
The behavior of the following functions from base can be easily predicted based on their type. Review the type of each of these functions and try to guess at how they are implemented. Use ghci to see if you were right. Are ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.