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Recursive function as a static method


Recursive function as a static method

By : Megaherzz
Date : November 18 2020, 03:01 PM
this will help You don't require an instance of the class to perform the correct name lookup; the class itself will do.
code :
class MyClass(object):
    @staticmethod
    def recursive_function(input):
        # ...
        sth = MyClass.recursive_function(subinput)
        # ...
        return sth


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Issue with a static recursive method

Issue with a static recursive method


By : Fabio Rocha
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , One major problem with your code is the use of the variable isInstanceValuePresent. Before recursively calling PopulateModelInstance you set the variable to false and then test the value once the method returns. Unfortunately this variable is a local variable, resides on the stack and as such is local to each call. It won't reflect the value set in your recursive call.
I have a suggestion how you could change your method. Instead of passing in an object to be populated, you could pass in the type of the object to be populated. Using the same logic you have already implemented, you would only instantiate an object of this type if you find a property value that can be set. The method then passes back the instance. If no property has been found to set then the method passes back null.
code :
private static Object CreateAndPopulateModelInstance(Type modelInstanceType, IDictionary<string, string> source)
{
    // this variable will hold the reference to the instance that is to be
    // populated. It will only hold a value, if a property is found that
    // can be populated.
    Object modelInstance = null;

    foreach (PropertyInfo propInfo in modelInstanceType.GetProperties())
    {
        //Identify Custom attribute 
        DataMappingKeyAttribute attribute =  DataMappingKeyAttribute)Attribute.GetCustomAttribute(propInfo, typeof(DataMappingKeyAttribute));

        if (attribute != null && !string.IsNullOrEmpty(attribute.MappingKey))
        {
            if (propInfo.PropertyType.IsPrimitive || propInfo.PropertyType.Equals(typeof(string)))
            {
                string sourceKey = attribute.MappingKey;

                if (source.ContainsKey(sourceKey))
                {
                    // Get propInfo attribute value from Dictionary
                    //var propertySourceValue = source[(propInfo.PropertyType.GetCustomAttribute(typeof(DataMappingKeyAttribute)) as DataMappingKeyAttribute).MappingKey];
                    string sourceValue = source[attribute.MappingKey];

                    // Set propInfo value on the model instance
                    if (CanChangeType(sourceValue, propInfo.PropertyType) && propInfo.CanWrite && (!propInfo.PropertyType.IsClass || propInfo.PropertyType.Equals(typeof(string))))
                    {
                        // create instance if necessary
                        if (modelInstance == null)
                            modelInstance = Activator.CreateInstance(modelInstanceType);

                        propInfo.SetValue(modelInstance, Convert.ChangeType(sourceValue, propInfo.PropertyType), null);
                    }
                }
            }
        }
        else if (propInfo.PropertyType.IsClass && !propInfo.PropertyType.Equals(typeof(string)) && propInfo.CanWrite)
        {
            Object propertyValue = CreateAndPopulateModelInstance(propInfo.PropertyType, source);
            if (propertyValue != null)
            {
                // create instance if necessary
                if (modelInstance == null)
                    modelInstance = Activator.CreateInstance(modelInstanceType);

                // set property value
                propInfo.SetValue(modelInstance, propertyValue, null);
            }
        }
    }

    return modelInstance;
}
private static Object CreateAndPopulateModelInstance(Object instance, Type modelInstanceType, IDictionary<string, string> source)
{
    // this variable will hold the reference to the instance that is to be
    // populated. It will only hold a value, if a property is found that
    // can be populated.
    Object modelInstance = instance;
            Object propertyValue = CreateAndPopulateModelInstance(null, propInfo.PropertyType, source);
            if (propertyValue != null)
            {
PHP static method recursive

PHP static method recursive


By : LesliBachemin
Date : March 29 2020, 07:55 AM
seems to work fine Is it possible to do a recursion on a static method? , Try this
code :
return array_map(['Helpers', 'objectToArray'], $obj);
return array_map([__CLASS__, __METHOD__], $obj);
return array_map([self, __METHOD__], $obj);
Calling a static method from another static method: PHP Fatal error: Call to undefined function

Calling a static method from another static method: PHP Fatal error: Call to undefined function


By : Ben Choi
Date : March 29 2020, 07:55 AM
this one helps. Indeed, like @hindmost said: Use self:: instead of WP_City_Gender::!
So for instance:
code :
class WP_City_Gender {
....
    public static function valid($str) {
        return (isset($str) && strlen($str) > 0);
    }
    ...
    public static function user_register($user_id) {
        if (self::valid($_POST[FIRST_NAME]))
        ...
    }
}
recursive function for upheap method(how can i write this non-recursive method into recursive)

recursive function for upheap method(how can i write this non-recursive method into recursive)


By : rockstarofin
Date : March 29 2020, 07:55 AM
I wish this help you The point is to rewrite the while loop into recursive method calls. This is very simple:
code :
protected void upHeap(int j) {
  if (j <= 1) //this handles the condition of the original while loop
    return;
  int p = parent(j);
  if (compare(heap.get(j), heap.get(p)) >= 1) 
    return; // this handles the break from the while loop
  swap(j, p);
  upHeap(p); // the recursive method call, replacing j with p
}
Issue with PowerMockito verifyStatic() method for a static recursive function in Java

Issue with PowerMockito verifyStatic() method for a static recursive function in Java


By : user2969229
Date : March 29 2020, 07:55 AM
should help you out The problem here is that you are invoking intercepted method from inside of spied/mocked object. Interception is made when call is made from the outside. So original call is "registered" but not the internal one.
I am not sure it is a bug or expected behavior, but I have ran into the same issue some time ago (but not with statics) and If I recall I redesigned the test.
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