July 2023
Intermediate to advanced
670 pages
17h 13m
English
Content preview from Effective HaskellBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Creating a Pager
A pager is a program that lets a user display text from a file one page at a time. The term “pager” isn’t used very frequently these days, but if you’ve ever used common command-line programs like less or man you’ve used a pager.
A pager is a great example of a small utility that will let you apply all of the different concepts that you’ve been learning about to build a single complete application that does something recognizable while still being small enough to start and finish as you work through this chapter.
Fundamentally, our pager needs to let us do three things:
- Output the contents of an ASCII or UTF8 encoded text file to the screen
- Scroll the output backwards and forwards one page at a time
- Display some metadata, like ...
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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.