Category: General Coding


Best strategies for configuring multiple environments in Xcode projects

October 21, 2018

General Coding

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What things do you configure based on different environments? You might have views that are only for debugging, or you might want to turn off logging for release builds. You probably have multiple backend environments to configure like dev, QA, UAT, stage, prod, etc. Each of these requires different root URLs, API keys and app secrets. The app may also integrate with social media, crash reporting tool, or other analytics tools and we shouldn’t pollute this data with our testing efforts. We might also want to change the app icon and app name to make it visible which environment an installed app is running.

It’s easy enough to develop simple iOS apps and not worry too much about configurations. When you are just starting, it’s probably ok to do some setup with code, modifying the values as needed. You might even try commenting/uncommenting lines of code to switch between different configurations. Some people use #if DEBUG. Either of these will become problematic, quickly. It’s error-prone and time-consuming. So, what do we do?

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Master map, compactMap, flatMap, reduce and filter by creating your own implementation

February 21, 2018

General Coding, Playground, Reference

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There are a few higher-order functions for collections that can be rather difficult to fully understand. While there are several good resources out there to learn the basics, it can still be confusing and seem a bit like magic. And when things seem like magic they tend to not get used effectively or maybe not at all.

In this post, I’m going to try explaining map, compactMap, flatMap, reduce and filter by walking through their inputs, outputs and deriving an implementation for each. For simplicity, we will focus on arrays but this can be expanded to most data structures. The goal is only learning the ideas, not to implement the best possible solution.Read More »


Beyond 128-bit integers

December 24, 2017

General Coding, Reference

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I just finished a post related to the top range of integer values that are supported by Swift.

https://kenb.us/big-integers

The conclusion was that we can use the Decimal type to hold integer values with up to nearly 128 bits. That’s an impressively large number.

It’s hard to imagine a case where you would require both a larger number and precision at the least significant figures. However, it does make an interesting exercise so let’s give it a shot.

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How to store large integer values without losing precision

December 23, 2017

General Coding, Reference

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I recently wanted to use some very large numbers in Swift and quickly came across some limitations.

 

Int

My first implementation started out naively with Int (Int64) type. This is, after all, the easiest way to use integers.

The limitations are also easy to understand.
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3 ways to extract numbers from a string

December 3, 2017

General Coding, Performance, Reference

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I’m working on a project which requires me to parse some data that was formatted more for readability than parsing. Similar to NSStringFromCGRect which outputs in the format “{{x,y},{width,height}}”

let rect = CGRect(x: 124, y: 387, width: 74, height: 74)
let text = NSStringFromCGRect(rect)
// "{{124, 387}, {74, 74}}"

This string can easily be read back again using it’s counterpart function NSStringFromRect.

let text = "{{124.123, 387}, {74, 74}}"
let rect = NSRectFromString(text)

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