Recent questions tagged functional

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functional programming - Map function in MATLAB?

I'm a little surprised that MATLAB doesn't have a Map function, so I hacked one together myself since it's something I ... map( @(x)x^2,1:10) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - Why program functionally in Python?

At work we used to program our Python in a pretty standard OO way. Lately, a couple guys got on the ... more of Python's functional features. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - What is Hindley-Milner?

I encountered this term Hindley-Milner, and I'm not sure if grasp what it means. I've read the following ... you please offer a concise answer? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional dependencies - Partial Dependency (Databases)

I fabricated a definition that a partial dependency is when fields are indirectly dependent on the primary key or partially ... if not what is? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - How can I pre-set arguments in JavaScript function call? (Partial Function Application)

I am trying to write a JavaScript function that will return its first argument(function) with all the rest of its ... a better way to do this. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - Composing functions in python

I have an array of functions and I'm trying to produce one function which consists of the composition of the ... want the functions to be) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - Are any JavaScript engines tail call (TCO) optimized?

I have a tail recursive pathfinding algorithm that I've implemented in JavaScript and would like to know if ... get stack overflow exceptions. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - Best explanation for languages without null

Every so often when programmers are complaining about null errors/exceptions someone asks what we do without null. ... (other aspects I missed) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - Is there a way to do currying in C?

Say I have a pointer to a function _stack_push(stack* stk, void* el). I want to be able to call curry( ... far cleverer people than me here :). Any ideas? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - How to call Python functions dynamically

I have this code: fields = ['name','email'] def clean_name(): pass def clean_email(): pass How can I call ... doesn't work. How to do this with Python? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - What is the difference between eq?, eqv?, equal?, and = in Scheme?

I wonder what the difference is between those operations in Scheme. I have seen similar questions in Stack Overflow but they ... ) --> #t Why is this the case? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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772 views

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functional programming - Is there a Haskell idiom for updating a nested data structure?

Let's say I have the following data model, for keeping track of the stats of baseball players, teams ... functional programming and Haskell and static typing. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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858 views

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functional programming - How do pipes and monads work together in JavaScript?

I have looked at similar questions and answers and have not found an answer that directly addresses my ... syncUserWithCore, managejwt.maketoken)(x, y) Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - Python: Why is functools.partial necessary?

Partial application is cool. What functionality does functools.partial offer that you can't get through ... functools somehow more efficient, or readable? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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754 views

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functional programming - What does (f .) . g mean in Haskell?

I have seen a lot of functions being defined according to the pattern (f .) . g. For example: countWhere = (length ... = (concat .) . map What does this mean? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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797 views

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functional programming - What is a Y-combinator?

Closed. This question needs to be more focused. It is not currently accepting answers. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - Set operations (union, intersection) on Swift array?

Are there any standard library calls I can use to either perform set operations on two arrays, or ... as functionally and also efficiently as possible)? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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730 views

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functional programming - Stack overflows from deep recursion in Java?

After some experience with functional languages, I'm starting to use recursion more in Java - But the language ... when I do Project Euler problems. Thanks. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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688 views

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functional programming - What is referential transparency?

What does the term referential transparency mean? I've heard it described as "it means you can replace ... but this seems like an inadequate explanation. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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843 views

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functional programming - What is the difference between Scala's case class and class?

I searched in Google to find the differences between a case class and a class. Everyone mentions that when you ... learn more about the Scala case classes from? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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913 views

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functional programming - What is the motivation for Scala assignment evaluating to Unit rather than the value assigned?

What is the motivation for Scala assignment evaluating to Unit rather than the value assigned? A common pattern in I/O ... . I am wondering why it was done so? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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755 views

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functional programming - Monad in plain English? (For the OOP programmer with no FP background)

In terms that an OOP programmer would understand (without any functional programming background), what is a monad? What ... of the monads to the OOP app? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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813 views

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functional programming - Idiomatic R code for partitioning a vector by an index and performing an operation on that partition

I'm trying to find the idiomatic way in R to partition a numerical vector by some index vector, ... R functional programming tools like mapply/aggregate etc. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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843 views

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functional programming - Partition a Java 8 Stream

How to implement "partition" operation on Java 8 Stream? By partition I mean, divide a stream into sub- ... are lazily-evaluated Streams rather than List's. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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924 views

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functional programming - Can you explain closures (as they relate to Python)?

I've been reading a lot about closures and I think I understand them, but without clouding the picture for myself ... where and why I would want to use them. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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776 views

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functional programming - What is Scala's yield?

I understand Ruby and Python's yield. What does Scala's yield do? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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704 views

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functional programming - What is a 'Closure'?

I asked a question about Currying and closures were mentioned. What is a closure? How does it relate to currying? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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937 views

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functional programming - Zipping streams using JDK8 with lambda (java.util.stream.Streams.zip)

In JDK 8 with lambda b93 there was a class java.util.stream.Streams.zip in b93 which could be used to zip ... code (which doesn't use functionality from b98). Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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