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What is PostgreSQL explain telling me exactly?
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The part I always found confusing is the startup cost vs total cost. I Google this every time I forget about it, which brings me back to here, which doesn't explain the difference, which is why I'm writing this answer. This is what I have gleaned from the Postgres EXPLAIN docum...
How can I check for “undefined” in JavaScript? [duplicate]
... a tight loop you will lose some performance. jsperf.com/type-of-undefined-vs-undefined/6
– Jamie Pate
Jul 10 '13 at 17:25
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What is the difference between `new Object()` and object literal notation?
... me the question was more about the differences between using new Object() vs {} to create empty objects.
– Peter
Oct 10 '14 at 0:42
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Is there an advantage to use a Synchronized Method instead of a Synchronized Block?
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}
private synchronized void someOutputRelatedWork() {
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}
vs.
// Using specific locks
Object inputLock = new Object();
Object outputLock = new Object();
private void someInputRelatedWork() {
synchronized(inputLock) {
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}
}
private void someOutputRelatedWork()...
Select distinct values from a table field
... The Meta: ordering = () "feature" of django orm and objects.distinct() vs. objects.ordering().distinct() caused us hours of confusion. There should be a consumer-safety warning sticker on that product;) We may institute a no-Meta-ordering-attribute policy to prevent the head-scratching in the fu...
Red black tree over avl tree
... same/similar amortized cost but produces better balanced tree (1.44log(N) vs 2log(N)). In the same time, deletion in AVL tree may require more rotations. IMHO, this is addressed in WAVL en.wikipedia.org/wiki/WAVL_tree
– Sergey Shandar
Jan 23 '18 at 19:08
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Using Rails 3.1, where do you put your “page specific” JavaScript code?
...overall works faster for user. At least its more like conflict one js file vs many(i.e. look at stackoverflow.com/questions/555696/…). Also there is nothing bad in using classes and ids on body if it makes code simpler and works for you. Modernizr(modernizr.com) does this, and some other libs too....
Why does Python use 'magic methods'?
...needed. Also probably different __ main__ handling would be nice in shells vs interactive. Anyway, check out all the functions, and see what it is like without them:
dir (__builtins__)
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del __builtins__
share
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How do you declare an interface in C++?
... better example. I like to think of it in terms of inheriting an interface vs. inheriting an implementation. In C++ you can either inherit both interface and implementation together (public inheritance) or you can inherit only the implementation (private inheritance). In Java you have the option of...
How to choose between Hudson and Jenkins? [closed]
...mfortable with that and decided to leave.
So it comes down to what Hudson vs Jenkins offers. Both Oracle's Hudson and Jenkins have the code. Hudson has Oracle and Sonatype's corporate support and the brand. Jenkins has most of the core developers, the community, and (so far) much more actual work.
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