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Number of lines in a file in Java
... You can see that countLinesOld has a few outliers, and countLinesNew has none and while it's only a bit faster, the difference is statistically significant. LineNumberReader is clearly slower.
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Convert a Unix timestamp to time in JavaScript
... numbers far more efficiently than strings. When string concatenation is done, there's a lot of memory management going on in the background. (However, if you're already doing a string concatenation anyway, then including a few extra characters in one of the strings might actually be less costly o...
What is the best way to test for an empty string in Go?
...taste and about clarity.
Russ Cox writes in a golang-nuts thread:
The one that makes the code clear.
If I'm about to look at element x I typically write
len(s) > x, even for x == 0, but if I care about
"is it this specific string" I tend to write s == "".
It's reasonable to assu...
Mutable vs immutable objects
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Great response. One small question however: doesn't C++ have good support for immutability? Isn't the const-correctness feature sufficient?
– Dimitri C.
Sep 2 '10 at 7:13
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setNeedsLayout vs. setNeedsUpdateConstraints and layoutIfNeeded vs updateConstraintsIfNeeded
...out autolayouts–says:
If something changes later on that invalidates one of your constraints, you should remove the constraint immediately and call setNeedsUpdateConstraints. In fact, that’s the only case where you should have to trigger a constraint update pass.
In addition, in my experie...
Use String.split() with multiple delimiters
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Try this regex "[-.]+". The + after treats consecutive delimiter chars as one. Remove plus if you do not want this.
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Adding dictionaries together, Python [duplicate]
I have two dictionaries and I'd like to be able to make them one:
6 Answers
6
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SQL Update with row_number()
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One more option
UPDATE x
SET x.CODE_DEST = x.New_CODE_DEST
FROM (
SELECT CODE_DEST, ROW_NUMBER() OVER (ORDER BY [RS_NOM]) AS New_CODE_DEST
FROM DESTINATAIRE_TEMP
) x
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How to manage a redirect request after a jQuery Ajax call
...problem to yours. I perform an AJAX request that has 2 possible responses: one that redirects the browser to a new page and one that replaces an existing HTML form on the current page with a new one. The jQuery code to do this looks something like:
$.ajax({
type: "POST",
url: reqUrl,
da...
Should struct definitions go in .h or .c file?
... of struct s in headers and just declarations—is there any advantage to one method over the other?
6 Answers
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