currying

how to write a sum function with infinite number of arguments, using currying in javascript?

由 牧云@^-^@ 提交于 2019-12-08 13:16:55
问题 I have tried writing the below code to find sum of 'n' numbers using sum function. I am getting the correct response in output . But i am unable to return that using sum function, as i always have to return a function, which is required for curried effect. Please help. Thanks in advance. var output = 0, chain; function sum() { var args = Array.prototype.slice.call(arguments); output += args.reduce(function(a, b) { return a + b; }); sumCurried = sum.bind(output); sumCurried.val = function() {

sum(2)(3) and sum(2, 3) what is the common solution for both

由 别来无恙 提交于 2019-12-08 08:52:22
问题 I was asked this question in an interview. for sum(2)(3) in currying style sum(a) { return (b) { return a + b; } } for sum (2, 3) sum(a, b) { return a + b; } Is there any common function which can work for both 回答1: Here's a function that can create a generalized curried function from any non-curried function. It is written without using any ECMAScript 6 syntax. This works regardless of the number of parameters expected by the original function, or the number of arguments provided to each

Add multiple variable passed as parameter to function currying

由 こ雲淡風輕ζ 提交于 2019-12-08 05:58:09
问题 How can I achieve these scenarios using function currying? add(3,4)(3) add(3)(4)(3) add(3)(4,3) I have read so many blogs not able to find this kind of scenario. can someone help me on this. 回答1: Something like this? var total = 0; function add(){ // Add up every argument received for (var i in arguments) total += arguments[i]; return add; } add(3,4)(3); console.log(total); add(3)(4)(3); console.log(total); add(3)(4,3); console.log(total); Update If you do not want the function to depend on

Converting between Func with different # of type args

由 梦想的初衷 提交于 2019-12-08 04:30:31
Are there built in methods for converting between the various types of Func delegates? That is, suppose you need a Func, but you have a Func (and you have the value that should be passed in for the T parameter). For example: static TREsult Foo<TResult>(Func<TResult> f) { // ... TResult result = f(); // ... return result; } static int MyFunc(int i) { return i; } void CallFoo() { Func<int> func = ConvertFunc(MyFunc, 1); // Does this family of methods exist? int j = Foo(func); } I've written my own, like this: static Func<TResult> ConvertFunc<T, TResult>(Func<T, TResult> f1, T t) { return () =>

Bind only second argument to javascript function

由 混江龙づ霸主 提交于 2019-12-07 12:23:06
问题 var add = function(a, b) { return a + b; } var addOne =add.bind(null,1); var result = addOne(4); console.log(result); Here the binded value of a is 1 and b is 4. How to assign the binding value i.e)1 to the second argument of the function without using spread operator(...) 回答1: You could take a swap function with binding the final function. var add = function (a, b) { console.log(a, b); return a + b; }, swap = function (a, b) { return this(b, a); }, addOne = swap.bind(add, 1), result = addOne

Ruby Reverse Currying: Is this possible?

由 六眼飞鱼酱① 提交于 2019-12-07 06:07:21
问题 Concerning currying in Ruby 1.9.x, I've been using it in some places, and can be translated like basically supporting default parameters to the proc arguments: p = proc {|x, y, z|x + y + z} p.curry[1] #=> returns a lambda p.curry[1, 2] #=> returns a lambda p.curry[1, 2, 3] #=> 6 p2 = p.curry[1, 2] p2.(2) #=> 5 p2.(4) #=> 7 very handy, right? thing is, I would like to be able to curry in reverse, that means, fill the last argument of my proc with a random value. Like this: p = proc{|x, y| x -

How to combine Curry() with Vectorize()?

由 ＊爱你＆永不变心＊ 提交于 2019-12-07 04:18:49
问题 Consider the following function: addAmount <- function(x, amount) { stopifnot(length(x) == 1) return(x + amount) } It can be used to add some amount to x : > addAmount(x = 5, amount = 3) [1] 8 > addAmount(x = 2, amount = 3) [1] 5 However, x must be of length 1: > addAmount(x = 7:9, amount = 3) Error: length(x) == 1 is not TRUE I added this restriction intentionally for exemplification. Using Vectorize , it is possible to pass in a vector for x : > Vectorize(addAmount)(x = 7:9, amount = 3) [1]

Python currying with any number of variables

由 ≡放荡痞女 提交于 2019-12-07 03:09:36
问题 I am trying to use currying to make a simple functional add in Python. I found this curry decorator here. def curry(func): def curried(*args, **kwargs): if len(args) + len(kwargs) >= func.__code__.co_argcount: return func(*args, **kwargs) return (lambda *args2, **kwargs2: curried(*(args + args2), **dict(kwargs, **kwargs2))) return curried @curry def foo(a, b, c): return a + b + c Now this is great because I can do some simple currying: >>> foo(1)(2, 3) 6 >>> foo(1)(2)(3) 6 But this only works

F# parameter passing

由 陌路散爱 提交于 2019-12-07 02:39:55
问题 I've always thought that F# had two different ways to pass arguments, curry style and tuple style. Is this actually correct? Isn't it simply one style , curry style, and arguments can either be simple values or tuples. e.g. someFunc (a,b) = isn't this a function with one curry style argument which happens to be a tuple ? Thus allowing me to pass tuples to this function using the pipleline operator? (where the elements of the tuple is named) (1,2) |> someFunc Is this correct? 回答1: This will

Why can't I implicitly cast a Delegate with Extension methods?

由 戏子无情 提交于 2019-12-07 01:02:59
问题 I'm trying to figure out a way to automatically cast something to an Action or Func and the best I can come up with is something like this: [TestFixture] public class ExecutionTest { public void BadMethod() { throw new Exception("Something bad happened"); } [Test] public void TestBadMethod() { // Want this, but it won't work!! // BadMethod.Execute().IgnoreExceptions(); // Ick ((Action)BadMethod).Exec().IgnoreExceptions(); // Still ick ((Action)BadMethod).IgnoreExceptions(); // Do not want
订阅 currying