Recent questions tagged Functional

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functional programming - How to define division operator in Agda?

I want to divide two natural number. I have made function like this _/_ : N -> N -> frac m / one = ... know what to write here. Please help. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - The right way to use a data structure in OCaml

Ok, I have written a binary search tree in OCaml. type 'a bstree = |Node of 'a * 'a bstree * 'a bstree | ... a value into the tree at any time? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - Clojure- Defining a variable inside of a function?

I have this variable, hand, that works just fine when I define it on its own. (def yourHand (map ;;fn ... outside of the function! Any advice? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - Merge of lazy streams (using generators) in Python

I'm playing with functional capacities of Python 3 and I tried to implement classical algorithm for calculating Hamming ... -numbers 5))))) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - Pattern matching key in Erlang maps

I have a map of form shown below: Map = #{#{country=>"India"} => #{rank => 1}}. I am trying to match it ... . Any help as to how it can be done? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - Simple non-optimal unionfind in OCaml

I wrote a OCaml program for union find algorithm. This algorithm I wrote is not optimal and is the simplest version. ... 't learnt to that part. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - Difference between Monads and Functions

Ok, about Monad, I am aware that there are enough questions having been asked. I am not trying to bother ... . Am I understanding it correctly? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - Haskell: What is immutable data?

in most articles about Haskell you'll find a statement like "Data in Haskell is immutable". I don't quite understand ... :/ Have a good day! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - Slice/Group a sequence of equal chars in F#

I need to extract the sequence of equal chars in a text. For example: The string "aaaBbbcccccccDaBBBzcc11211" ... solution can be better? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - Scala Type Syntax

I've observed that, if I want to make a generic function that can accept a list of any type and return a ... A]" in the first syntax example. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - How to express let* as a lambda expression (not the regular let)

I have a scheme related question, how can we implement let* as a lambda expression. To be more precise, ... one let expression within another. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - Scala: Function0 vs by-name parameters

Can anyone give a definitive answer on how by-name parameters => T and Function0 parameters () => T are ... there are no lazy types). See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - Do-while loop in Clojure?

So I want to first execute a bunch of code, and then ask the user if he wants to do that again. I ... without going through the do-while route? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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532 views

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functional programming - Specify arity using only or except when importing function on Elixir

I'm studying Elixir and when I use only or except operators when importing functions from a module I need to specify an ... [sin: 1, cos: 1] See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - Access atomic vectors shown by Filter(is.atomic, eq) in R

Filter(is.atomic, something) returns atomic vectors. 1. Weather -example here > Filter(is.atomic, study) ... I access their atomic vectors? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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636 views

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functional programming - Currying in javascript for function with n parameters

If f :: (a, b) -> c, we can define curry(f) as below: curry(f) :: ((a, b) -> c) - ... curry function that takes a function with n parameters? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - How to reconcile Javascript with currying and function composition

I love currying but there are a couple of reasons why a lof of Javascript devs reject this technique: aesthetic ... coworkers don't hate me? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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548 views

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functional programming - Python reduce explanation

I'm not able to understand the following code segment: >>> lot = ((1, 2), (3, 4), (5,)) >>> reduce(lambda t1 ... a tuple of (1,2,3,4,5) ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - The differences between underscore usage in these scala's methods

What is the difference and the term name between these underscore usage from these codes: (see the handler(resource) part) ... isn't, isn't it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - How to shuffle list in O(n) in OCaml?

It is not hard to shuffle an array in O(n), with in place swapping, How to do it for list in ... usage Consider this as an interview question See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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564 views

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functional programming - Can I always convert mutable-only algorithms to single-assignment and still be efficient?

The Context The context of this question is that I want to play around with Gene Expression Programming ... characteristics they need? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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714 views

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functional programming - How do you copy an array in common lisp?

I'd like to make copies of my 2D array, which feels like the nice, functional, nondestructive way of handling ... the lispy way of doing this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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689 views

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functional programming - Why do I need to use the unit type in F# if it supports the void type?

I read this MSDN article: Unit Type (F#) ...The unit type is a type that indicates the absence of a specific ... explain more about this to me. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - Haskell Fibonacci Explanation

I am quite new to Haskell and I'm trying to wrap my head around how the lazy expression of Fibonacci sequences ... the entire list plus <thunk>? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - F# - Function with no arguments?

When thinking in a functional mindset, given that functions are supposed to be pure, one can conclude any ... it evaluated on declaration? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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631 views

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functional programming - Currying function with unknown arguments in JavaScript

In a recent interview, I was asked to write a function that adds numbers and accepts parameters like this: ... I implement this add function? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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550 views

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functional programming - What is the purpose of single assignment?

I'm currently trying to master Erlang. It's the first functional programming language that I look into and I noticed ... can we get from it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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628 views

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functional programming - Partial Function Evaluation in MATLAB

Is there an idiomatic way to bind variables in a MATLAB function? It seems like it would be fairly common to ... % compute the actual root end See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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