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What is the arity of the following complex terms?

By : Aline Oliveira
Date : November 20 2020, 01:01 AM
wish help you to fix your issue Notice that what you call "complex terms" are normally called coumpound terms in Prolog. You can easily check for the arity of Prolog terms yourself in the following way:
code :
``````?- functor(vertical(line(point(X,Y), point(X,Z))), _, Arity).
Arity = 1.
``````
``````?- functor(f(), _, Arity).
ERROR: functor/3: Domain error: `compound_non_zero_arity' expected, found `f()'
?- compound_name_arity(f(), _, Arity).
Arity = 0.
``````

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Why is Method#arity called, well, arity?

By : Nuclearflames
Date : March 29 2020, 07:55 AM
will be helpful for those in need Because that's actually the name for it. http://en.wikipedia.org/wiki/Arity
I pronounce it AIR-i-TEE like in polarity.

How to define an arbitrary arity function in Haskell, which includes an arity of 0?

By : Praveen
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further My current approach to define a function of arbitrary arity is below, with A being an accumulator, E being the input argument type, and R being the result type. , What about
code :
``````class X r where
foo :: A -> r

instance X r => X (E -> r) where
foo :: A -> E -> r
foo a e = foo (combine a e)
``````

Proc.arity vs Lambda.arity

By : Hrsk
Date : March 29 2020, 07:55 AM
seems to work fine Why do proc and lambda return different values for arity? , Per the docs you linked to:
code :
``````>> p = proc { |a = 1, b| b }
=> #<Proc:0x007ff0091ef810@(irb):1>
>> l = lambda { |a = 1, b| b }
=> #<Proc:0x007ff0098099f8@(irb):2 (lambda)>
>> p.call
=> nil
>> l.call
ArgumentError: wrong number of arguments (0 for 1..2)
from (irb):2:in `block in irb_binding'
from (irb):4:in `call'
from (irb):4
from /usr/local/bin/irb:12:in `<main>'
``````
``````lambda{||}.arity # => 0. No arguments expected
lambda{|x| x}.arity # => 1. One argument expected
lambda{|x,y| x+y}.arity # => 2. Two arguments expected
``````
``````lambda {|*args|}.arity # => -1. ~-1 = -(-1)-1 = 0 arguments required
lambda {|first, *rest|}.arity # => -2. ~-2 = -(-2)-1 = 1 argument required
``````
``````puts lambda {}.arity # –1 in Ruby 1.8; 0 in Ruby 1.9
``````

Is it possible to describe a function of: (any-arity => 1-arity)?

By : user6524802
Date : March 29 2020, 07:55 AM
I wish did fix the issue. I'd like to be able to pass in a function to a class such that the function always returns a Boolean, but the number of arguments can be variable. , Got it.
code :
``````/**
* Template class for any SecureSocial SecuredAction that involves using user information.
* @param isSuccessful: SecuredRequest[AnyContent] => Boolean
*/
class UserReqAction(
isSuccessful: (SecuredRequest[AnyContent] => Boolean),
success: Result, failure: Result) extends SecureSocial {
implicit request => if (isSuccessful(request)) success else failure
}
}

/**
* Template class for any SecureSocial SecuredAction that does not use user information.
* @param isSuccessful: SecuredRequest[AnyContent] => Boolean
*/
class UserNotReqAction(isSuccessful: () => Boolean,
success: Result, failure: Result) extends SecureSocial {
implicit request => if (isSuccessful()) success else failure
}
}

// not curried example
def makeNewThing = new UserReqAction(
userOp.createThing,
Ok(Json.toJson(Json.obj("success" -> true, "msg" -> "Thing successfully created"))),

// curried example
def editThing(param1: _, param2: _, etc) = new UserReqAction(
userOp.updateThing(param1, param2, etc), // this is the currying
Ok(Json.toJson(Json.obj("success" -> true, "msg" -> "Thing successfully edited"))),

def updateThing(param1: _, param2: _, etc)(request: SecuredRequest[AnyContent] ) {...}
``````

Showing serial terms using the complex bit masks

By : Arnab Bhattacharya
Date : March 29 2020, 07:55 AM
wish help you to fix your issue I need to make a method for displaying serial terms based on the number associated with these days. , Try the code below
code :
``````    [Flags]
enum DaysBitMask { Sun = 1, Mon = 2, Tues = 4, Wed = 8, Thu = 16, Fri = 32, Sat = 64 }

{
DayOfWeek dayCursor = currentDay;

for (int counter = 0; counter < 7; counter++)
{
int cursorMask = 0x01 << (int)dayCursor;