November 2016
Intermediate to advanced
480 pages
14h 42m
English
Content preview from Swift Programming: The Big Nerd Ranch Guide
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Protocols
A protocol allows you to define the interface you want a type to satisfy. A type that satisfies a protocol is said to conform to the protocol.
Define a protocol that specifies the interface you need for the printTable(_:withColumnLabels:) function. The function needs to know how many rows and columns there are, what the label for each column is, and what data should be displayed in each cell. It does not matter to the Swift compiler where in your playground file you put this protocol. But it probably makes the most sense to put it just before printTable(_:withColumnLabels:), because you are going to use the protocol in the function.
Listing 19.5 Defining a protocol
...
protocol TabularDataSource {
var numberOfRows: ...Become 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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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.
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