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Counting numbers in Functional Programming Style?


Counting numbers in Functional Programming Style?

By : D.J
Date : November 19 2020, 03:01 PM
wish help you to fix your issue You could use recursion to get a (more) functional programming solution:
code :
(function counter(a, n){
    console.log(a);
    a < n && counter(a+1, n);
})(1, 10);


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When is it appropriate to choose point-free style vs a data-centric style in functional programming?

When is it appropriate to choose point-free style vs a data-centric style in functional programming?


By : Charles Hall
Date : March 29 2020, 07:55 AM
This might help you I know of no evidence that demonstrates advantages of one style over the other. But there is a clear trend in the history of programming towards higher abstractions... and an equally clear history of resistance to this trend. A move from Assembly to Fortran or LISP was a move up the abstraction stack. The use of SQL rather than bespoke B-tree retrievals was a another. The move to FP, both within a language like Javascript and in the changing landscape of programming languages, is to my mind a similar move.
But much of that has to do with elements more fundamental than this syntactic decision: equational reasoning means that we can build our own abstractions on top of more solid footing. So purity and immutability are essential; point-free is merely nice to have.
code :
const foo = (arg) => {
  const qux = baz(arg)
  return bar(qux)
}
const foo = (arg) => bar(baz(arg))
const foo = compose(bar, baz)
Java Functional Programming: How to convert a if-else ladder inside for loop to functional style?

Java Functional Programming: How to convert a if-else ladder inside for loop to functional style?


By : Lardher
Date : March 29 2020, 07:55 AM
Any of those help The question title is quite broad (convert if-else ladder), but since the actual question asks about a specific scenario, let me offer a sample that can at least illustrate what can be done.
Because the if-else structure creates three distinct lists based on a predicate applied to the item, we can express this behavior more declaratively as a grouping operation. The only extra needed to make this work out of the box would be to collapse the multiple Boolean predicates using a tagging object. For example:
code :
class Item {
    enum Category {A, B, AB}

    public Category getCategory() {
        return /* ... */;
    }
}
Map<Item.Category, List<Item>> categorized = 
    items.stream().collect(Collectors.groupingBy(Item::getCategory));
Difference between traditional imperative style of programming and functional style of programming

Difference between traditional imperative style of programming and functional style of programming


By : 陳嘉興
Date : March 29 2020, 07:55 AM
wish help you to fix your issue Stream API introduces the new idea of streams which allows you to decouple the task in a new way. For example, based on your task it's possible that you want to do different things with the doubled even numbers greater than three. In some place you want to find the first one, in other place you need 10 such numbers, in third place you want to apply more filtering. You can encapsulate the algorithm of finding such numbers like this:
Find the top N numbers in an endless stream of integers in a functional programming style

Find the top N numbers in an endless stream of integers in a functional programming style


By : Brad Roberts
Date : October 09 2020, 10:00 PM
may help you . I came across this interesting Scala problem and not sure how to solve it: , If you have a function topNSoFar:
code :
def topNSoFar(n: Int)(prev: List[Int], next: Int): List[Int] = ???
def findTopN(n: Int)(stream: Stream[Int]): Stream[List[Int]] =
  stream.foldLeft(List.empty[Int])(topNSoFar(n))
Is this statement true that Java 8 provides functional style but is not functional programming?

Is this statement true that Java 8 provides functional style but is not functional programming?


By : pati1892
Date : September 28 2020, 04:00 AM
this one helps. Here is a (non-exhaustive) list of abstract FP concepts:
Focus on immutability Referential transparency for functions Limitations on side effects (follows from 1 & 2) Expression-based, no statements. Statements are not first-class. Functions as first-class values. State changes as first-class values (e.g. Clojure atoms). Algebraic Data Types as fundamental units. Enforcing some or all of the above via the type system.
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