September 2016
Intermediate to advanced
270 pages
5h 16m
English
Content preview from Mastering PHP Design PatternsBecome 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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Specification design pattern
The Specification design pattern is incredibly powerful. Here, I will attempt to provide a high-level overview of it, but there is plenty to explore; I highly recommend the paper Specifications by Eric Evans and Martin Fowler if you are interested in learning more.
This design pattern is used to codify business rules that state something about an object. They tell us whether an object satisfies some business criteria or not.
We can use them in the following ways:
- To make assertions about an object, for validation
- To fetch a selection of objects from a given collection
- To specify how an object can be created by building to order
In this example, we're going to build Specification to query
Let's take the following objects: ...
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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.