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Best way to find if an item is in a JavaScript array? [duplicate]
What is the best way to find if an object is in an array?
8 Answers
8
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grep a file, but show several surrounding lines?
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For BSD or GNU grep you can use -B num to set how many lines before the match and -A num for the number of lines after the match.
grep -B 3 -A 2 foo README.txt
If you want the same number of lines before and after you can use -C num.
grep -C 3 foo README.txt
Th...
NodeJS: Saving a base64-encoded image to disk
My Express app is receiving a base64-encoded PNG from the browser (generated from canvas with toDataURL() ) and writing it to a file. But the file isn't a valid image file, and the "file" utility simply identifies it as "data".
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Benefit of using Parcelable instead of serializing object
... could just put the huge memory consuming object on a static variable, and set it to null right when you fetch it (on onCreate for example). The disadvantage is that it doesn't support multi-processes, and it's a bit dirty way to do it. Wonder if that's the case if you wish to pass a large bitmap.
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How to exit a function in bash
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Note that if you have set -e set at the top of your script and your return 1 or any other number besides 0, your entire script will exit.
– Yevgeniy Brikman
May 6 '16 at 10:53
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How to find the statistical mode?
...ind the mode of a 10M-integer vector in about half a second.
If your data set might have multiple modes, the above solution takes the same approach as which.max, and returns the first-appearing value of the set of modes. To return all modes, use this variant (from @digEmAll in the comments):
Mode...
How to minify php page html output?
I am looking for a php script or class that can minify my php page html output like google page speed does.
13 Answers
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How to find day of week in php in a specific timezone
...one);
$UserDateTime = new DateTime("now", $userDateTimeZone);
$offsetSeconds = $UserDateTime->getOffset();
//echo $offsetSeconds;
return gmdate("l", time() + $offsetSeconds);
}
Report if you find any corrections.
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How to save all the variables in the current python session?
...config import get_conf_path, get_supported_types
data = globals()
settings = VariableExplorer.get_settings()
get_supported_types()
data = globalsfilter(data,
check_all=True,
filters=tuple(get_supported_types()['pi...
Numpy `logical_or` for more than two arguments
....any(axis=0)
k = 10 # number of arrays to be combined
perfplot.plot(
setup=lambda n: [numpy.random.choice(a=[False, True], size=n) for j in range(k)],
kernels=[
lambda l: and_recursive(*l),
lambda l: and_reduce(*l),
lambda l: and_stack(*l),
lambda l: or_recu...