October 2014
Intermediate to advanced
280 pages
7h 20m
English
Content preview from Programming Elixir
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case
case lets you test a value against a set of patterns, executes the code associated with the first one that matches, and returns the value of that code. The patterns may include guard clauses.
For example, the File.open function returns a two-element tuple. If the open is successful, it returns {:ok, file}, where file is an identifier for the open file. If the open fails, it returns {:error, reason}. We can use case to take the appropriate action when we open a file. (In this case the code opens its own source file.)
| control/case.ex | |
| | case File.open("case.ex") do |
| | { :ok, file } -> |
| | IO.puts "First line: #{IO.read(file, :line)}" |
| | { :error, reason } -> |
| | IO.puts "Failed to open file: #{reason}" |
| | end |
produces:
| | First line: case File.open("case.ex") ... |
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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.