2021年8月20日 · seq.map 接受偶数个参数或者 0 个参数，不传入任何参数就是一个空的 map，可以通过 seq.put 来增加元素。 同样，对于 map ，你可以用 m.{key} 的方式来访问：

Seq.groupBy 采用一个序列和一个根据元素生成键的函数。 将针对序列的每个元素执行该函数。 Seq.groupBy 返回一个元组序列，其中每个元组的第一个元素是键，第二个元素是生成该键的元素序列。

2023年6月7日 · Sequences are represented by the seq<'T> type, which is an alias for IEnumerable<T>. Therefore, any .NET type that implements IEnumerable<T> interface can be used as a sequence. The Seq module provides support for manipulations involving sequences. A sequence expression is an expression that evaluates to a sequence.

2012年2月15日 · 本文介绍了F#中Seq模块的功能及用法，Seq模块提供了一系列处理IEnumerable类型数据的强大函数，如map、iter、fold等，并对比了Seq与List的不同之处。 如果你熟悉F#中的list，你可能知道List模块中包含了很多方便快捷的用来处理多种集合类型数据的 函数，其实Sequence与List相似，也是拥有着大量此类函数，这些函数可以用来处理任何实现了IEnumerable接口的集合类型。 Sequence与List 最大的区别在于Sequence 在任意时刻，内存 …

Apply a function to every element of a sequence using Seq.map. Got any F# Question? ChatGPT answer me! Get monthly updates about new articles, cheatsheets, and tricks.

2014年10月4日 · let cross l1 l2 = seq { for el1 in l1 do for el2 in l2 do yield el1, el2 };; and use this function to get the job done: cross [1..10] [1..10] |> Seq.map (fun (a,b) -> a*b) |> Seq.toList

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Compares two sequences using the given comparison function, element by element. Combines the given enumeration-of-enumerations as a single concatenated enumeration. Tests if the sequence contains the specified element.

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2011年4月4日 · Use a mutable dictionary (or another relevant collection type) instead of a Map. Try using the dict function instead of Map.ofSeq, for instance. The problem here is that by adding StructuralComparison attribute to the type Category you've asked F# to use structural comparison when comparing instances of Category.