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LINQ To Objects and the performance of nested "Where" calls

This post came out of this Stack Overflow question, which essentially boils down to which is better out of these two options: var oneBigPredicate = collection.Where(x => Condition1(x) ...

Posted to Jon Skeet: Coding Blog by skeet on Thu, Jun 16 2011
Filed under: Filed under: C#, LINQ, Benchmarking
Edulinq - the e-book

I'm pleased to announce that I've made a first pass at converting the blog posts in the Edulinq series into e-books. I'm using Calibre to convert to PDF and e-book format. I still have a way to go, but they're at least readable. The Kindle version (MOBI format) is working somewhat better...

Posted to Jon Skeet: Coding Blog by skeet on Fri, Mar 18 2011
Filed under: Filed under: C#, Books, LINQ, Edulinq
Reimplementing LINQ to Objects: Part 45 - Conclusion and List of Posts

Table of Contents You may consider it a little odd to have a list of posts as the final part in the series, but it makes sense when you consider that visiting the Edulinq tag page shows results in reverse chronological order. At that point, a newcomer will hopefully hit this post first , and then find...

Posted to Jon Skeet: Coding Blog by skeet on Wed, Feb 23 2011
Filed under: Filed under: C#, LINQ, Edulinq
Reimplementing LINQ to Objects: Part 44 - Aspects of Design

I promised a post on some questions of design that are raised by LINQ to Objects. I suspect that most of these have already been covered in other posts, but it may well be helpful to talk about them here too. This time I've thought about it particularly from the point of view of how other APIs can...

Posted to Jon Skeet: Coding Blog by skeet on Mon, Feb 21 2011
Filed under: Filed under: C#, LINQ, Edulinq
Reimplementing LINQ to Objects: Part 43 - Out-of-process queries with IQueryable

I've been putting off writing about this for a while now, mostly because it's such a huge topic. I'm not going to try to give more than a brief introduction to it here - don't expect to be able to whip up your own LINQ to SQL implementation afterwards - but it's worth at least having...

Posted to Jon Skeet: Coding Blog by skeet on Sun, Feb 20 2011
Filed under: Filed under: C#, LINQ, Edulinq
Reimplementing LINQ to Objects: Part 42 - More optimization

A few parts ago, I jotted down a few thoughts on optimization. Three more topics on that general theme have occurred to me, one of them prompted by the comments. User-directed optimizations I mentioned last time that for micro-optimization purposes, we could derive a tiny benefit if there were operators...

Posted to Jon Skeet: Coding Blog by skeet on Sun, Jan 30 2011
Filed under: Filed under: C#, LINQ, Edulinq
Reimplementing LINQ to Objects: Part 41 - How query expressions work

Okay, first a quick plug. This won't be in as much detail as chapter 11 of C# in Depth . If you want more, buy a copy. (Until Feb 1st, there's 43% off it if you buy it from Manning with coupon code j2543.) Admittedly that chapter has to also explain all the basic operators rather than just query...

Posted to Jon Skeet: Coding Blog by skeet on Fri, Jan 28 2011
Filed under: Filed under: C#, LINQ, Edulinq
Reimplementing LINQ to Objects: Part 40 - Optimization

I'm not an expert in optimization, and most importantly I don't have any real-world benchmarks to support this post, so please take it with a pinch of salt. That said, let's dive into what optimizations are available in LINQ to Objects. What do we mean by optimization? Just as we think of...

Posted to Jon Skeet: Coding Blog by skeet on Wed, Jan 26 2011
Filed under: Filed under: C#, LINQ, Edulinq
Reimplementing LINQ to Objects: Part 39 - Comparing implementations

While implementing Edulinq, I only focused on two implementations: .NET 4.0 and Edulinq. However, I was aware that there were other implementations available, notably LinqBridge and the one which comes with Mono . Obviously it's interesting to see how other implementations behave, so I've now...

Posted to Jon Skeet: Coding Blog by skeet on Tue, Jan 25 2011
Filed under: Filed under: C#, LINQ, Edulinq
Reimplementing LINQ to Objects: Part 38 - What's missing?

I mentioned before that the Zip operator was only introduced in .NET 4, so clearly there's a little wiggle room for LINQ to Object's query operators to grow in number. This post mentions some of the ones I think are most sorely lack - either because I've wanted them myself, or because I've...

Posted to Jon Skeet: Coding Blog by skeet on Sat, Jan 22 2011
Filed under: Filed under: C#, LINQ, Edulinq
Reimplementing LINQ to Objects: Part 37 - Guiding principles

Now that I'm "done" reimplementing LINQ to Objects - in that I've implemented all the methods in System.Linq.Enumerable - I wanted to write a few posts looking at the bigger picture. I'm not 100% sure of what this will consist of yet; I want to avoid this blog series continuing...

Posted to Jon Skeet: Coding Blog by skeet on Thu, Jan 20 2011
Filed under: Filed under: C#, LINQ, Edulinq
Reimplementing LINQ to Objects: Part 36 - AsEnumerable

Our last operator is the simplest of all. Really, really simple. What is it? AsEnumerable has a single signature: public static IEnumerable<TSource> AsEnumerable<TSource>( this IEnumerable<TSource> source) I can describe its behaviour pretty easily: it returns source. That's...

Posted to Jon Skeet: Coding Blog by skeet on Fri, Jan 14 2011
Filed under: Filed under: C#, LINQ, Edulinq
Reimplementing LINQ to Objects: Part 35 - Zip

Zip will be a familiar operator to any readers who use Python. It was introduced in .NET 4 - it's not entirely clear why it wasn't part of the first release of LINQ, to be honest. Perhaps no-one thought of it as a useful operator until it was too late in the release cycle, or perhaps implementing...

Posted to Jon Skeet: Coding Blog by skeet on Fri, Jan 14 2011
Filed under: Filed under: C#, LINQ, Edulinq
Reimplementing LINQ to Objects: Part 34 - SequenceEqual

Nearly there now... What is it? SequenceEqual has two overloads - the obvious two given that we're dealing with equality: public static bool SequenceEqual<TSource>( this IEnumerable<TSource> first, IEnumerable<TSource> second)...

Posted to Jon Skeet: Coding Blog by skeet on Fri, Jan 14 2011
Filed under: Filed under: C#, LINQ, Edulinq
Reimplementing LINQ to Objects: Part 33 - Cast and OfType

More design decisions around optimization today, but possibly less controversial ones... What are they? Cast and OfType are somewhat unusual LINQ operators. They are extension methods, but they work on the non-generic IEnumerable type instead of the generic IEnumerable<T> type: public static...

Posted to Jon Skeet: Coding Blog by skeet on Thu, Jan 13 2011
Filed under: Filed under: C#, LINQ, Edulinq
Reimplementing LINQ to Objects: Part 32 - Contains

After the dubious optimizations of ElementAt/ElementAtOrDefault yesterday, we meet an operator which is remarkably good at defying optimization. Sort of. Depending on how you feel it should behave. What is it? Contains has two overloads, which only differ by whether or not they take an equality comparer...

Posted to Jon Skeet: Coding Blog by skeet on Wed, Jan 12 2011
Filed under: Filed under: C#, LINQ, Edulinq
Creating Property Set Expression Trees In A Developer Friendly Way

In a previous post I showed how to create expression trees to set properties on an object. The way I did it was not very developer friendly. It involved explicitly creating the necessary expressions because the compiler won’t generate expression trees with property or field set expressions. Recently...

Posted to Paulo Morgado by Paulo Morgado on Tue, Jan 11 2011
Filed under: Filed under: .NET, C#, LINQ, .NET4.0, CodeProject, C#4.0, ExpressionTrees
Reimplementing LINQ to Objects: Part 31 - ElementAt / ElementAtOrDefault

A nice easy pair of operators tonight. I should possibly have covered them at the same time as First/Last/Single and the OrDefault variants, but never mind... What are they? ElementAt and ElementAtOrDefault have a single overload each: public static TSource ElementAt<TSource>( ...

Posted to Jon Skeet: Coding Blog by skeet on Tue, Jan 11 2011
Filed under: Filed under: C#, LINQ, Edulinq
Reimplementing LINQ to Objects: Part 30 - Average

This is the final aggregation operator, after which I suspect we won't need to worry about floating point difficulties any more. Between this and the unexpected behaviour of Comparer<string>.Default, I've covered two of my "big three" pain points. It's hard to see how I could...

Posted to Jon Skeet: Coding Blog by skeet on Mon, Jan 10 2011
Filed under: Filed under: C#, LINQ, Edulinq
Reimplementing LINQ to Objects: Part 29 - Min/Max

The second and third AOOOD operators today... if I'm brave enough to tackle Average tomorrow, I'll have done them all. More surprises here today, this time in terms of documentation... What are they? Min and Max are both extension methods with 22 overloads each . Min looks like this: public ...

Posted to Jon Skeet: Coding Blog by skeet on Sun, Jan 9 2011
Filed under: Filed under: C#, LINQ, Edulinq

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