Category: Misc Languages

Camilo Reyes takes us through a useful concept in computer science as applied to .NET Core:

Performance sensitive code is often overlooked in business apps. This is because high-performance code might not affect outcomes. Concerns with execution times are ignorable if the code finishes in a reasonable time. Apps either meet expectations or not, and performance issues can go undetected. Devs, for the most part, care about business outcomes and performance is the outlier. When response times cross an arbitrary line, everything flips to less than desirable or unacceptable.

Luckily, the Big-O notation attempts to approach this problem in a general way. This focuses both on outcomes and the algorithm. Big-O notation attempts to conceptualize algorithm complexity without laborious performance tuning.

This is a rather high-level take on the idea, as it doesn’t cover any of the O(NlogN) or O(logN) algorithms out there. But if you are not familiar with the concept, it is good to know.

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Sarfaraz Hussain explains the difference between foldLeft and foldRight in Scala:

The fold method is a Higher Order Function in Scala and it has two variant namely,
i. foldLeft
ii. foldRight
In this blog, we will look into them in detail and try to understand how they work.

Before moving ahead, I want to clarify that the fold method is just a wrapper to foldLeft, i.e. the fold method internally invokes the foldLeft method. So, now let’s get started.

Folding is an extremely powerful technique for getting rid of loops in code. Being comfortable with folding is (in my eyes) one of the signs which indicate that you’ve reached a mid-level understanding of functional programming.

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Erik Ejlskov Jensen takes us through auto-pluralization with Entity Framework Core:

If you are using the EF Core console command dotnet ef dbcontext scaffold or Package Manager Console in Visual Studio Scaffold-DbContext, you can hook up pluralization via code in your project.

First you must add a reference to the Microsoft.EntityFrameworkCore.Design package from your startup project.

Click thorugh for a code sample.

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Sarfaraz Hussain takes us through one of the most important concepts in functional languages:

Normally we write function and it seems like below:

def multiplySimple(a: Int, b: Int): Int = a * b

We declare a function with all the arguments needed inside a single parameter list.

In currying however, we can split this parameter list into multiple parameter lists.

def multiplyCurry(a: Int)(b: Int): Int = a * b

This doesn’t seem like much, but it does lead to partial application of functions and is one method for how we can have multiple inputs in a functional programming language when mathematical functions allow one input.

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