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How to determine how Ruby method arguments will be bound without calling the method


By : Josh Jin
Date : September 17 2020, 05:00 AM
this one helps. Because there are a few different kinds of method parameters in Ruby (required, default, keyword, variable length...), sometimes determining how actual arguments will be bound to formal parameters can be tricky. , You might go with a tiny DSL for that purpose.
code :
module Watcher
  def self.prepended(base)
    base.instance_methods(false).map do |m|
      mthd = base.instance_method(m)
      names = mthd.parameters.map(&:last).map(&:to_s)
      values = names.join(", ")
      params =
        mthd.parameters.map do |type, name|
          case type
          when :req then name.to_s
          when :rest then "*#{name}"
          when :keyrest then "**#{name}"
          when :block then "&#{name}"
          end
        end.join(", ")
      base.class_eval """
        def #{m}(#{params})
          #{names}.zip([#{values}]).to_h
        end
      """
    end
  end
end

class A; def zoo(a, *b, c); 42; end; end
A.new.zoo(1,2,3,4,5)
#⇒ 42

A.prepend Watcher
A.new.zoo(1,2,3,4,5)
#⇒ {"a"=>1, "b"=>[2, 3, 4], "c"=>5}


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How to count the arguments of a method before calling that method wich is inside a class?


By : Mark Steven Pajarill
Date : March 29 2020, 07:55 AM
it helps some times I think what you need is ReflectionMethod
code :
 $reflection = new ReflectionMethod($_SITE, $acao);
 $qtdArgumentos = $reflection->getNumberOfParameters();

Do I need to synchronize access the method arguments and locals when calling a method concurrently?


By : Alex
Date : March 29 2020, 07:55 AM
help you fix your problem
What you have there won't make any difference at all - the arguments themselves cannot change after the call has been made, so it really does nothing. In your case with strings, it's perfectly safe seeing how string is immutable. When that isn't the case, it is possible that whatever is passed is altered somewhere else. In that case you'd have to make a real copy (i.e. not just copying the reference),

Method signature is not recognized properly when calling it (No overload for method xxx takes 2 arguments)


By : user3016735
Date : March 29 2020, 07:55 AM
Hope this helps Based on the comment chain, this sounds like one or more of your projects aren't building. You can verify which projects are set to build under Build > Configuration Manager.

Pythonic way of calling a method with large number of arguments inside another method


By : user2006323
Date : March 29 2020, 07:55 AM
hope this fix your issue What I would do here really depends on the actual purpose of your functions. There is no way to avoid passing arguments as such, but there are ways to make the code shorter and more legible under the right conditions.
I would first determine if foo works for arbitrary inputs or not. If the arguments are really distinct and serve different purposes, I would leave it as-is and accept that the argument list is going to be long. If, on the other hand, some arguments are not really distinct and can be treated as a sequence, I would make that explicit using splat notation. The key is not so much to modify the inputs as to rewrite foo itself to handle arbitrary inputs:
code :
from operator import mul
from functools import reduce

def foo(*args):
     return reduce(mul, args)
def foo(arg1, arg2, *args):
     return arg2 * (arg1 + reduce(mul, args))
def bar(arg4, *args, **kwargs):
    return arg4 * foo(*args, **kwargs)
def bar(arg4, foo_args=None, foo_kwargs=None):
     if foo_args is None:
         foo_args = ()
     if foo_kwargs is None:
         foo_kwargs = {}
     return arg4 * foo(*foo_args, **foo_kwargs)

Arguments not compatible when calling method when they are the exact same format as in method class


By : Shrikanth Kote
Date : March 29 2020, 07:55 AM
Hope that helps The problem is pretty straightforward. What you're trying to do is pass a local variable declaration to the printTransitionTable method. You need to correctly declare and initialize the table variable.
code :
static void printTableOf(final FSAe A)  {
    final int[][][] table = Utils.transitionTable(A);
    Utils.printTransitionTable(table);
}
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