# Tag Archives: immutable

## Combinations Part 5 – (wrapping it up)

The original problem as posed by Eric Lippert was to write a function to produce all the combinations of k elements from a collection of n elements. So far I’ve ported the code to product all the combinations of k … Continue reading

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## Combinations – Part 4 (combinations of booleans)

In this article we’ll implement the combinations function from Eric Lippert’s post. Here he implements a function that returns all the combinations of n booleans with k of them set to true. See part 3 of his series. Let’s implement … Continue reading

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## Combinations – Part 3 (SequenceOf extensions)

I want to continue on with my implementation of Combinations. But first, when working on this problem I determined I really needed some helper methods on SequenceOf. Initially these were very complicated but as my comfort level increased I figured … Continue reading

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## Combinations – Part 2

Last time I started working on the combinations problem that Eric Lippert wrote about: We’ll be working a lot with SequenceType, SequenceOf, GeneratorType and GeneratorOf. I’m more familiar with the enumerating type of C# (IEnumerable and IEnumerator). Together SequenceType and … Continue reading

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## Combinations – Part 1

I’ve had a difficult time trying to understand the collections in the Swift programming language from Apple. In particular, I’ve been trying to identify the analog of the IEnumerable type from C#. I don’t think there is one. As an … Continue reading

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## Immutable Data Structures

During the last few years I’ve become more familiar with functional languages. My current favorite is Haskell. During this same time period, I’ve also become more familiar with the existence of efficient immutable data structures which are pretty much a … Continue reading