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Questions tagged [arity]

The arity of a function or operation is the number of arguments or operands that the function takes.

The arity of a function or operation is the number of arguments or operands that the function takes.

The term "arity" is rarely employed in everyday usage. For example, rather than saying "the arity of the addition operation is 2" or "addition is an operation of arity 2" one usually says "addition is a binary operation". In general, the naming of functions or operators with a given arity follows a convention similar to the one used for n-based numeral systems such as binary and hexadecimal. One combines a Latin prefix with the -ary ending; for example:

  • A nullary function takes no arguments.
  • A unary function takes one argument.
  • A binary function takes two arguments.
  • A ternary function takes three arguments.
  • An n-ary function takes n arguments.
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Clojure defresource argument arity error with Liberator

I am writing a clojure function that works fine when I am using defnto define it, but it throws arity error when instead I define it using defresource. I suspect it's something to do with the :as-response key that I am using but I have no clue how…
user13532746
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How to generalize program according to arity in prolog?

I use swi prolog. I have a fact base like this consisting of facts with arity 4. attribute(a1,a2,a3,a4). data(yes,no,no,no). data(yes,no,yes,no). data(yes,yes,yes,no). data(yes,yes,yes,yes). data(no,yes,yes,yes). And my code calculate probability…
Tolga
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How to right a variable length currying function or a general currying function for all type of inputs?

function currying(func) { //I need to complete this for all diiferent forms of add } //1st form const add = currying(function (a, b) { return a + b; }) add(1, 2) //should yield 3 add(1)(2) //should yield 3 //second form const add =…
kapil pandey
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How to use map in Haskell with a variable and a list

I'm planning to write am map function which essentially takes in a variable and a list and returns a list. I've tried to use standard map but from what I've seen it's in the format "map function list" when here I'm trying to pass in another argument…
James Morgson
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What is "type ascription" referring to in this case?

What is error ascription referring to in this case and how can I fix my code to println based on the arity passed in? Running the code below throws the error: error: expected type, found `10` --> src/main.rs:21:27 | 21 | …
Armeen Moon
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Why is scala.collection.immutable.List[Object] not GenTraversableOnce[?]

Simple question, and sorry if this is a stupid question as I am just beginning in scala. I am getting a type mismatch error that says: found : (AnyRef, org.apache.tinkerpop.gremlin.hadoop.structure.io.VertexWritable) => List[Object] required:…
Paul
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Why does my implementation of Haskell snd not compile in Scala?

I defined the following function along the lines of Haskell snd def snd[T](pair: (_, T)): T = pair._2 Trying to use it with a List[ListNode[T]] doesn't compile. Why not? list .reduceOption(snd) where: case class ListNode[T](data: T, var next:…
Abhijit Sarkar
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What is the arity of the following complex terms?

I understand that the two facts are expressed using complex terms which again have complex terms as arguments. There are three levels of terms nested inside terms. vertical(line(point(X,Y), point(X,Z))). horizontal(line(point(X,Y),…
CJ Carter
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Arity exception in clojure

I have this piece of code. (defn get-movie [name-movie contents] (loop [n (count contents) contents contents] (let [movie (first contents)] (if (= (:name (first contents)) name-movie) (movie) (recur (dec n) (rest contents)))))) I have…
Shalima Sidhik
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Why call void on an unknown argument before returning another function call?

What's the significance of calling void before returning in ramda's arity function?
c24w
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SyntaxException in Arity.jar

I am using the Arity Arithmetic Engine for my calculations. So I wanted to know what are all the exceptions that can arise when I use double res = Symbols.eval("string"); Im enclosing this in a try block as try{ double res =…
Aftab Khan
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Scala abstract value members on list returning unexpected result?

I'm not sure if this is a bug or I don't understand Scala well enough. I was playing in the REPL today with some list functions. Here's what I did: First, I created a list: scala> val myList = List(1.0, 2.0, 3.0) myList: List[Double] = List(1.0,…
Eric Keyte
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How can two arguments be passed to a method with a one-argument signature?

s = Proc.new {|x|x*2} def one_arg(x) puts yield(x) end one_arg(5, &s) How does one_arg know about &s?
uzo
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How do you find the arity of an anonymous function in strict mode?

Following the jQuery plugin pattern, how can one find the arity of a function, say the methods.myfunc function, in the case where we've used apply() to define the scope of this and applying arguments to this? (function($, window, document ){ "use…
qodeninja
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Is it possible to dynamically create functions with specific arguments without using eval or the Function constructor?

Very similar to this Python question but for JavaScript. I'm using a library that relies on nodejs-depd which uses new Function() to dynamically wrap functions in deprecation messages: function wrapfunction(fn, message) { if (typeof fn !==…
mikemaccana
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