decorator

javascript - What's the '@' (at symbol) in the Redux @connect decorator?

The @ symbol is in fact a JavaScript expression currently proposed to signify decorators: Decorators make it possible to annotate and modify classes and properties at design time. Here's an example... Read More

When to Use the Decorator Pattern?

The Decorator Pattern is used for adding additional functionality to a particular object as opposed to a class of objects. It is easy to add functionality to an entire class of objects by subclassing... Read More

decorators in the python standard lib (@deprecated specifically)

Here's some snippet, modified from those cited by Leandro: import warnings import functools def deprecated(func): """This is a decorator which can be used to mark functions as deprecated. It... Read More

Python decorator best practice, using a class vs a function

It is rather subjective to say whether there are "advantages" to each method. However, a good understanding of what goes under the hood would make it natural for one to pick the best choice for each... Read More

angular - Angular2 Component @Input two way binding

For [(toggled)]="..." to work you need @Input() toggled: boolean; @Output() toggledChange: EventEmitter<boolean> = new EventEmitter<boolean>(); changeValue() { this.toggled = !(this.toggled... Read More

Python decorator handling docstrings

Use functools.wraps() to update the attributes of the decorator: from functools import wraps def decorator(f): @wraps(f) def _decorator(): print 'decorator active' f() re... Read More

How do the Proxy, Decorator, Adapter, and Bridge Patterns differ?

Proxy, Decorator, Adapter, and Bridge are all variations on "wrapping" a class. But their uses are different. Proxy could be used when you want to lazy-instantiate an object, or hide the fact that y... Read More

python - Is there a decorator to simply cache function return values?

Starting from Python 3.2 there is a built-in decorator: @functools.lru_cache(maxsize=100, typed=False) Decorator to wrap a function with a memoizing callable that saves up to the maxsize most recent... Read More

python - Making decorators with optional arguments

The cleanest way I know of for doing this is the following: import functools def decorator(original_function=None, optional_argument1=None, optional_argument2=None, ...): def _decorate(functio... Read More

decorator - Why does @foo.setter in Python not work for me?

You seem to be using classic old-style classes in python 2. In order for properties to work correctly you need to use new-style classes instead (in python 2 you must inherit from object). Just declar... Read More