December 2018
Intermediate to advanced
414 pages
10h 19m
English
Content preview from Hands-On Design Patterns with Swift
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A simple RPN Calculator app
The app we are going to implement is a simplified version of an RPN Calculator. The UI will have an upper section, which will show the four upper values in the stack in reversed order, and a lower part with the numbers 0 to 9, the four basic operations, and an Enter key, which will put the value in the stack.
When we create the app using the wizard in Xcode, we must remember to check the two boxes to add Unit and UI tests.
The view in the storyboard mimics a simple calculator with the basic operations and four entries for the stack; as we mentioned earlier, the stack is upside down, with the topmost element at the bottom. The button with the e represents Enter, which will push the elements in the stack up and insert ...
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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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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.