F# Collections

November 23, 2021 Posting Komentar

Allowing the use of expridx is based on repeated feedback from those learning F or seeing F for the first time that the use of dot-notation indexing comes across as an unnecessary divergence from standard industry practice. I referenced the FSharpCore dll and wrote the following.

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FSharpxCollections is a collection of datastructures for use with F and C.

F# collections. Best practices in using F collections. There are five native F ones. The F types are mostly describing types that are not collection types.

More specifically only the array. F collections are built-in and were made with F in mind thats why they will be more idiomatic in use. Working with data is one of its strongest features as youll.

First a table with information about the different kinds of standard collections. F language and core library evolution. F provides simple Set and Map collections because the more specialized purely functional set and map collections are basically a waste of time.

This release sees the addition of five new operations to the core collection functions in FSharpCore. F has its own unique collection types as well. Nearly everything weve done so far has involved a single record or tuple at a time.

The following are the F collection modules. F 6 allows the syntax expridx for indexing and slicing collections. Immutable collections are rather targeted at C.

Use the F language suggestions repo to search for ideas vote on ones you like submit new ideas and discuss details with the F community. Up to and including F 5 F has used expridx as indexing syntax. These collection types differ from the collection types in NET such as those in the SystemCollectionsGeneric namespace in that the F collection types are designed from a functional programming perspective rather than an object-oriented perspective.

Yet F has excellent capabilities when it comes to working with datasets. For example IntMap can be a bit faster than Map because it only works with int keys but an imperative Dictionary is usually 10x faster and can be 40x faster. Sum average min max Array List Seq All of these functions are specialized versions of a more generalized function fold.

The F collection features are mostly implemented as modules with the namespace of MicrosoftFSharpCollections. After disqualifying the BCL immutable collections for performance I decided that I probably also need to look at the F collection package to see if they do any better. FSharpxCollections is a collection of datastructures for use with F and C.

However for some strange reason this module seems to include ofArray and ofList and toSeq but not ofSeq. The F alias for SystemCollectionsGenericList is ResizeArray as kvb noted. The process is as follows.

List seq array map and set and ResizeArray and IDictionary are also often used. Each chapter presents a new use case where youll read how the author used F to solve a complex problem more effectively than would have been possible using a traditional approach. So in F code unless there is an open statement for SystemCollectionsGeneric the type List will mean the F immutable linked list but in C code or if the SystemCollectionsGeneric namespace is opened List refers to the mutable dynamically resized vector.

111 rows By reviewing this topic you can determine which F collection type best suits a particular need. Aggregate functions take a collection of items and merge them into a smaller collection of items often just one. FSharpCore 434 NuGet packages 21 Showing the top 5 NuGet packages that depend on FSharpxCollections.

15 rows FSharpCollections Namespace Operations for collections such as lists arrays sets maps. The F PowerPack includes a ResizeArray module for working with BCL Lists in an idiomatic F fashion similar to the Seq and List modules. Working with collections in F.

F Deep Dives presents a collection of real-world F techniques each written by expert practitioners. Something weve touched on only briefly is working with collections of data. Making F simpler.

Evolution of the F language and core library follows a process spanning two additional repositories. Private static FSharpMap long object FSharpAdd int iterations 2.

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