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Top Answer
Answered Jun 20, 2020 · 15 votes
It is to my knowledge that with Javascript when you delete an entry on a object, at least with chrome it puts the object into "dictionary mode" or "slow mode"
That isn't a JavaScript thing; that's an implementation characteristic of the V8 engine inside Chrome. This thread on the V8 users's list discusses this:
[ZenWolf] ...Does using the JavaScript "delete" keyword to delete a property from an object effect (sic) how v8 will optimize the object? ...
[Sven Panne] ...Deleting a property results in going to "slow mode", i.e. using a dictionary for the object's properties. So as a general rule of thumb, using 'delete' makes thing slower...
You can see this effect in this JSPerf. Note how browsers that use V8 (Chrome, Opera 20) are slower with the delete than without it. Firefox's latest SpiderMonkey is blindingly fast either way, IE10 and 11 are slightly impacted. (Interestingly, the engine Opera used for 10.5 through 12 [I think it was], Carakan, was even more impacted by the delete than V8.)
If you're writing code to be used in web browsers, optimizing for a specific engine tends to be a waste of time unless you're facing a specific, real-world performance problem on that engine. (And if you are, once you've dealt with that, make sure those changes don't mess up the other engines!)
If you were writing for NodeJS, SilkJS, etc., then of course optimizing for V8 is fine (although the normal rules of premature optimization still apply), as those are built specifically with V8.
Also is there any semantics around this mode?
No. The semantics of JavaScript are defined by the specification, which doesn't dictate how objects are implemented provided their behavior matches the semantics of the spec; the spec doesn't address performance basically at all. V8 implements objects by generating dynamic classes on-the-fly and compiling them to machine code, but falling back to "slow" (dictionary) mode when you remove properties from them. (If you add properties, the much more common operation as Sven Panne said in the quote above, it dynamically creates a derived class, which doesn't slow things down.) But other engines are free to implement them as hash maps, or linked lists of properties, or anything else.
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Top Answer
Answered Jun 08, 2011 · 4 votes
DFS is an abstraction layer on top of DFC.
SourceRebels is partially right, except for the detail that EMC is now treating DFS as a primary model of integration for external applications (API). You no longer need to use a compiled language (Java or .Net), since you can do everything via SOAP webservice calls. DFC remains available for low-level interaction, but with every Documentum release there are more services added to DFS.
One of the key differences is the object model. In DFS, you can create a batch of operations to send to the server for execution (for instance, create 10 objects). There are also some complex operations in DFS that would take much more code to accomplish using DFC. DFS also allows you to deploy your code to machines without the DFC installed.
Your best resource for Documentum-related questions is http://developer.emc.com.
2/5
Top Answer
Answered Dec 08, 2009 · 5 votes
I have been playing around with JavaFX the last months and i would not recommend anyone to start using it unless the limitations (like lack of Linux support) are too harsh. The IDE support for JavaFX is ridiculous at the moment. You have no refactoring help, no autoformat and not even help with indentaion.
I like JavaFX and will continue to play around with it, but for 2 equally good languages, the huge IDE different is hard to overcome.
Silverlight has got Expression Blend as well, for (kind of) WYSIWYG.
I think a solution in JavaFX would be better, but creating it will probably be alot more difficult.
3/5
Top Answer
Answered Mar 10, 2010 · 16 votes
It's impossible to say which is "better". Either can be used for most common user interface tasks.
If I could somehow summarize in a sentence, I would be tempted to say that Tkinter is better designed and a little easier to use, but wxPython is more feature-rich and looks a little bit nicer.
tkinter pros: part of python, nothing extra to download. Very simple syntax. The text widget is remarkably powerful and very easy to work with. The canvas widget is also very easy and powerful. No other toolkit provides the same mix of ease and power than those two widgets in my experience. Uses native widgets on the mac and windows. Tk is rock solid with few cross-platform idiosyncrasies. I think Tkinter's binding mechanism is far superior to wxPython's; it's more flexible and consistent. I think Tkinter's three geometry managers - pack, place and grid - are much more powerful and easy to use than the wxPython sizers.
tkinter cons: Uses motif-like widgets on *nix boxes which many find off-puting (though some careful tweaks can make GUIs look perfectly acceptable). Sometimes hard to debug in that Tkinter widgets at their core aren't python objects; tkinter provides a wrapper around the actual tk widgets which sometimes means you get weird error messages. There is very little printing support (you can generate postscript docs from the canvas, but there's no built-in support in the text widget for printing). Some people claim Tk is ugly. Tkinter isn't as "pythonic" as wxPython.
wxpython pros: It has many more widgets, though often that means there are three types of notebook widgets rather than one kitchen-sink widget. wxPython widgets are first class python objects which is really nice. wxPython generally looks better on *nix machines. wxPython seems to be more popular; some people care about that, some don't. wxPython has much better printing support than Tkinter.
wxPython cons: wxPython requires a separate download which can be a pain to manage when you deploy your app. Documentation is very weak in my opinion; it's very hard to find specific information. "wPython in Action" book provides a good introduction but can't be relied on as a reference book. wxPython is a bit buggy IMO, and there are definite cross-platform issues. I've seen wxPython crash and print assertions way more often than Tkinter.
4/5
Top Answer
Answered Jun 22, 2014 · 17 votes
An int key is simpler to implement and easier to use and understand. It's also smaller (4 bytes vs 16 bytes), so indexes will fit about double the number of entries per IO page, meaning better performance. The table rows too will be smaller (OK, not much smaller), so again you'll fit more rows per page = less IO.
Hash can always produce collisions. Although exceedingly rare, nevertheless, as the birthday problem shows, collisions become more and more likely as record count increases. The number of items needed for a 50% chance of a collision with various bit-length hashes is as follows:
Hash length (bits) Item count for 50% chance of collision 32 77000 64 5.1 billion 128 22 billion billion 256 400 billion billion billion billion-
There's also the issue of having to pass around non-ascii bytes - harder to debug, send over wire, etc.
Use int sequential primary keys for your tables. Everybody else does.
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www.geeksforgeeks.org › difference-between-fixed9 hours ago · While flexible exchange rates give resilience but also create exchange rate volatility, fixed exchange rates offer stability but restrict the flexibility of monetary policy. Every system has pros and cons, and nations are free to select the exchange rate regime that best suits their goals for trade, economic priorities, and policy.
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