Because it breaks encapsulation — this is why most people use accessors heavily. However, if you think it’s the right solution for your task, ignore it (meaning the strict encapsulation complaints) and do what’s right for your project. Don’t let the OO nazis tell you otherwise.
This can also happen when you have not initialized your class “world” as public you should do : public class world Instead of : class world
I attached an on(‘change’) event to the input you want to have trailing 0’s $(‘.number-input’).on(‘change’, function(){ $(this).val(parseFloat($(this).val()).toFixed(2)); }); It just takes the value, casts it to a float, renders it to a string to the number of decimal places, and puts it back in as the value.
Based on the variety of answers, Class “attributes”, “fields”, and “variables” are used relatively interchangeably but have nuanced distinctions that vary from person to person. As such, probably best to lump them together and not rely on the nuances. There’s consensus that a Class “member” includes methods as well as data, so it is distinct … Read more
You could use make_dataclass to create X on the fly: X = make_dataclass(‘X’, [(‘i’, int), (‘s’, str)]) x = X(i=42, s=”text”) asdict(x) # {‘i’: 42, ‘s’: ‘text’} Or as a derived class: @dataclass class X: i: int x = X(i=42) x.__class__ = make_dataclass(‘Y’, fields=[(‘s’, str)], bases=(X,)) x.s=”text” asdict(x) # {‘i’: 42, ‘s’: ‘text’}
There is also the ListField in django rest framework, see http://www.django-rest-framework.org/api-guide/fields/#listfield wtih the examples: scores = serializers.ListField( child=serializers.IntegerField(min_value=0, max_value=100) ) and (other notation): class StringListField(serializers.ListField): child = serializers.CharField() this seems simpler (maybe this class is added later than the accepted anwser, but seems good to add this option anyway) By the way, it’s added since … Read more
As others have noted, you cannot have a field of “ref to variable” type. However, just knowing that you cannot do it is probably unsatisfying; you probably also want to know first, why not, and second, how to get around this restriction. The reason why is because there are only three possibilities: 1) Disallow fields … Read more
You have to use reflection: Use Class.getField() to get a Field reference. If it’s not public you’ll need to call Class.getDeclaredField() instead Use AccessibleObject.setAccessible to gain access to the field if it’s not public Use Field.set() to set the value, or one of the similarly-named methods if it’s a primitive Here’s an example which deals … Read more
It doesn’t grant you anything extra beyond being concise. If you prefer the more verbose syntax, then by all means, use that. One advantage to using auto props is that it can potentially save you from making a silly coding mistake such as accidentally assigning the wrong private variable to a property. Trust me, I’ve … Read more
You use the StructTag type to get the tags. The documentation I linked has examples, look them up, but your code could be something like func (b example) PrintFields() { val := reflect.ValueOf(b) for i := 0; i < val.Type().NumField(); i++ { fmt.Println(val.Type().Field(i).Tag.Get(“json”)) } } NOTE The json tag format supports more than just field … Read more