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What is the rationale behind having companion objects in Scala?
...eton) for a class is needed? Why would I want to create a class, say Foo and also create a companion object for it?
7 Ans...
Postgres: Distinct but only for one column
...d catch on ordering. I didn't include it because they mentioned wanting a random ordering, but it's important to mention anyway.
– Craig Ringer
Jun 4 '13 at 12:49
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How to update bower.json with installed packages?
...list your dependencies:
bower list
Then you should run all install command with param '--save' like this:
bower install bootstrap --save
It's a hard work, but if you have a thousand dependencies, could you create a script to automatize the task.
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Regex - how to match everything except a particular pattern
...particular pattern? I'm faced with a situation where I have to match an (A and ~B) pattern.
8 Answers
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Which comment style should I use in batch files?
I've been writing some batch files, and I ran into this user guide , which has been quite informative. One thing it showed me was that lines can be commented not just with REM , but also with :: . It says:
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Change Git repository directory location.
...o do to move the repo files to C:\dir1 ? I can obviously physically copy and paste the files, but what do I need to do on the Git side?
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Get __name__ of calling function's module in Python
... this will interact strangely with import hooks, won't work on ironpython, and may behave in surprising ways on jython. It's best if you can avoid magic like this.
– Glyph
Jul 9 '09 at 11:24
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Simultaneously merge multiple data.frames in a list
... issue here is that each data.frame differs in terms of the number of rows and columns, but they all share the key variables (which I've called "var1" and "var2" in the code below). If the data.frames were identical in terms of columns, I could merely rbind , for which plyr's rbind.fill would...
How to loop through array in jQuery?
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}
Advantages: Straight-forward, no dependency on jQuery, easy to understand, no issues with preserving the meaning of this within the body of the loop, no unnecessary overhead of function calls (e.g., in theory faster, though in fact you'd have to have so many elements that the odds are you'd hav...
Check if an element is present in an array [duplicate]
...ates an includes() method for arrays that specifically solves the problem, and so is now the preferred method.
[1, 2, 3].includes(2); // true
[1, 2, 3].includes(4); // false
[1, 2, 3].includes(1, 2); // false (second parameter is the index position in this array at which to begin searching...