February 2018
Intermediate to advanced
340 pages
9h 43m
English
Content preview from Go Standard Library Cookbook
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How it works...
The core concept of the functional options pattern is that the configuration API contains the functional parameters. In this case, the NewClient function accepts a various number of ConfigFunc arguments, which are then applied one by one on the defaultClient struct. This way, the default configuration is modified with huge flexibility.
See the FromFile and FromEnv functions, which return the ConfigFunc, that is in fact, accessing the file or environmental variables.
Finally, you can check the output which applied both the configuration options and resulting Client struct that contains the values from the file and environmental variables.
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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.