September 2017
Beginner to intermediate
396 pages
9h 46m
English
Content preview from Haskell Cookbook
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Creating custom data types
In the model definition for Persistent, we can use data types such as Int, Text, and Int64. They are translated to proper SQL data types according to the SQL dialect that we are working with. Sometimes, the supported data types are not sufficient for our needs, and we might want to write a custom data type.
In this recipe, we will write a custom data type that represents email.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.