monkeypatching

I'm currently using (it's working fine) PrimeFaces.widget.OverlayPanel.prototype._old_init = PrimeFaces.widget.OverlayPanel.prototype.init; PrimeFaces.widget.OverlayPanel.prototype.init = function(cfg) { this._old_init(cfg); this.align(); } but I'd like to use something more readable and 'jQuery-ish' like this completely invented unrealistic code: PrimeFaces.widget.OverlayPanel.patch( { init: function(cfg) { super.init(cfg); this.align(); }, show: function() { console.log('blah blah blah'); super.show(); } }); I tried PrimeFaces.widget.Xxx.extend({...}) but in this case I have no access to

I understand that if go code is structured such that it's programmed to interfaces, it's trivial to mock; however, I'm working with a code base that I cannot change (that is not mine) and this is not the case. This code base is heavily interconnected and nothing is programmed to an interface, only structs, so no dependency injection. The structs, themselves, only contain other structs, so I can't mock out that way either. I don't believe that I can do anything about methods, and the few functions that exist are not variables, so there's no way that I know of to swap them out. Inheritance isn't

class String def hello "world" end end String.class_eval { def world "hello" end } "a".world => "hello" "b".hello => "world" They seems to do the same thing -- adding a method to a existing class. So what's the difference? With class_eval you can do more dynamic things: >> met = "hello" #=> "hello" >> String.class_eval "def #{met} ; 'hello' ; end" #=> nil >> "foo".hello #=> "hello" class_eval do conceptually class reopening (or monkey patching). There are mostly syntactic differences. If you pass string to class_eval (as in Michael's example) you have mostly the same syntax inside the string

In Python, the term monkey patch only refers to dynamic modifications of a class or module at runtime, As a beginner its really difficult to me understand this term in context of python. Can anybody explain to me with a real world example How exactly we do ? dynamic modifications of a class dynamic modifications of module at runtime I am insisting a real world example (as simple as possible) to understand in which scenarios we have to do such task ? Monkey-patching is a way to make some global under-the-hood change in a way that existing code will continue to run, but with modified behavior. A

Given a form class (somewhere deep in your giant Django app).. class ContactForm(forms.Form): name = ... surname = ... And considering you want to add another field to this form without extending or modifying the form class itself , why does not the following approach work? ContactForm.another_field = forms.CharField(...) (My first guess is that the metaclass hackery that Django uses applies only the first time the form class is constructed. If so, would there be a way to redeclare the class to overcome this?) Some pertinent definitions occur in django/forms/forms.py . They are: class BaseForm