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Take diff of two vertical opened windows in Vim
...hat's good answer, but note that minibufexplorer window should be closed before this operation, if opened. Otherwise diff shows incorrect results.
– baldrs
Jul 30 '14 at 13:28
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Python using enumerate inside list comprehension
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Try this:
[(i, j) for i, j in enumerate(mylist)]
You need to put i,j inside a tuple for the list comprehension to work. Alternatively, given that enumerate() already returns a tuple, you can return it directly without unpacking it first:
[p...
Scaling Node.js
...ale server-side development. I want to write a server using Node.js, but before I forge ahead I'd like to know what the general principles are for scaling node up to, say, 20 queries per second.
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Error in SQL script: Only one statement is allowed per batch
... run in a DACPAC in PostDeployment, but when I try to build the VS project for 3 of them I get this error:
3 Answers
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Unix shell script to truncate a large file
...a no-op in bash (POSIX-compliant), so this essentially just opens the file for writing (which of course truncates the file) and then immediately closes it.
EDIT: as shellter commented, you don't actually need a command to go along with the redirection:
$ echo foo > foo.txt
$ cat foo.txt
foo
$ &...
How to deal with “data of class uneval” error from ggplot2?
...s in the proper order mapping=..., data=.... Take a look at the arguments for ?geom_line.
Thus:
p + geom_line(data=df.last, aes(HrEnd, MWh, group=factor(Date)), color="red")
Or:
p + geom_line(aes(HrEnd, MWh, group=factor(Date)), df.last, color="red")
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JavaScript checking for null vs. undefined and difference between == and ===
...lso be true if a is null.
Now, despite the above, the usual way to check for those is to use the fact that they're falsey:
if (!a) {
// `a` is falsey, which includes `undefined` and `null`
// (and `""`, and `0`, and `NaN`, and [of course] `false`)
}
This is defined by ToBoolean in the s...
How to pass a variable from Activity to Fragment, and pass it back?
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this solution is not working for me, can't find where to import transaction from
– thebeancounter
Dec 19 '17 at 11:07
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Are static fields open for garbage collection?
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Static variables cannot be elected for garbage collection while the class is loaded. They can be collected when the respective class loader (that was responsible for loading this class) is itself collected for garbage.
Check out the JLS Section 12.7 Unloading...
How to convert BigDecimal to Double in Java?
...e, don't use it if you have currency manipulations. It should always be performed on BigDecimal objects directly. Precision loss in these calculations are big time problems in currency related calculations.
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