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node.js child process - difference between spawn & fork
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Spawn is a command designed to run system commands. When you run spawn, you send it a system command that will be run on its own process, but does not execute any further code within your node process. You can add listeners for the proces...
What's faster, SELECT DISTINCT or GROUP BY in MySQL?
...if you DON'T have an index (as it doesn't sort). When you do have an index and it's used, they're synonyms.
– Quassnoi
Feb 27 '09 at 15:11
10
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What is the difference between the add and offer methods in a Queue in Java?
... element can not be added to collection the add method throws an exception and offer doesn't.
From: http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html#add%28E%29
If a collection refuses to add a
particular element for any reason
other than that it already contains
the eleme...
How to use NSJSONSerialization
..."id": "2", "name":"Bbb"}]
This might give you a clear picture of how to handle it:
NSError *e = nil;
NSArray *jsonArray = [NSJSONSerialization JSONObjectWithData: data options: NSJSONReadingMutableContainers error: &e];
if (!jsonArray) {
NSLog(@"Error parsing JSON: %@", e);
} else {
for...
How to achieve code folding effects in Emacs?
...ntioned somewhere? Type C-sfoo, find the definition, press enter, read it, and then press C-x C-x to go back to where you were. Simple and very useful.
Most modes support imenu. M-ximenu will let you jump to a function definition (etc.) by name. You can also bind it to a mouse click to get a men...
Is it a bad practice to catch Throwable?
...n bugs might creep away this way.
Besides, Throwable covers Error as well and that's usually no point of return. You don't want to catch/handle that, you want your program to die immediately so that you can fix it properly.
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How to identify numpy types in python?
....g. numpy.ma.MaskedArray not a numpy enough type?
– panda-34
Mar 10 '16 at 13:02
If you want anything in numpy.* you j...
What is the difference between a route and resource in New Router API?
I am trying to understand the difference between a Route and a Resource . The way I understand Resource helps to set sub paths of a Route object to another Route Object. But its unclear when i think of default name mapping happening for paths as well.
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How to efficiently compare two unordered lists (not sets) in Python?
... Hey @Raymond, I recently encountered this question on an interview and I used sorted(), admittedly not knowing about Counter. The interviewer insisted there was a more efficient method and clearly I drew a blank. After extensive testing in python 3 with the timeit module, sorted consisten...
How is set() implemented?
...ython source code for set which, according to Achim Domma, is mostly a cut-and-paste from the dict implementation.
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