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When should I use the Visitor Design Pattern? [closed]

...want to make the fewest possible modifications to it. The Visitor pattern allows you to move each new operation in a suitable class, and you need to extend the hierarchy's interface only once. Let's do it. First, we define an abstract operation (the "Visitor" class in GoF) which has a method for ev...
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Javascript Drag and drop for touch devices [closed]

...r("touchcancel", touchHandler, true); } And in your document.ready just call the init() function code found from Here share | improve this answer | follow ...
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What is a good regular expression to match a URL? [duplicate]

... I changed your expression a bit so it will work in all cases i need, including uri with http:// or www "/([^\s\.]+\.[^\s]{2,}|www\.[^\s]+\.[^\s]{2,})/gi" – Ismael Jan 14 '15 at 11:08 ...
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Get all related Django model objects

How can I get a list of all the model objects that have a ForeignKey pointing to an object? (Something like the delete confirmation page in the Django admin before DELETE CASCADE). ...
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How to write a CSS hack for IE 11? [duplicate]

...p-equiv="X-UA-Compatible" content="IE=edge"> <style> @media all and (-ms-high-contrast:none) { .foo { color: green } /* IE10 */ *::-ms-backdrop, .foo { color: red } /* IE11 */ } </style> </head> <body> <div class="foo">Hi There!!!</...
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Convert a Scala list to a tuple?

...e of Scala sequence using the +: syntax. Also, don't forget to add a catch-all – ig-dev Jun 19 '19 at 8:33 add a comment  |  ...
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Backbone.js: get current route

... hashchange events or pushState, match the appropriate route, and trigger callbacks. You shouldn't ever have to create one of these yourself — you should use the reference to Backbone.history that will be created for you automatically if you make use of Routers with routes. [...]" If you need the...
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What do the terms “CPU bound” and “I/O bound” mean?

...U (doing calculations). A program that computes new digits of π will typically be CPU-bound, it's just crunching numbers. A program is I/O bound if it would go faster if the I/O subsystem was faster. Which exact I/O system is meant can vary; I typically associate it with disk, but of course networ...
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Delete column from SQLite table

...the columns, whereas something like the accepted answer seems to result in all columns to be of type TEXT. – Uwe Keim Jul 10 '17 at 15:05 2 ...
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How to detect that animation has ended on UITableView beginUpdates/endUpdates?

...ates . I am also using beginUpdates/endUpdates when adjusting rowHeight. All these operations are animated by default. 7 ...