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Test if a command outputs an empty string
...ll do something like this:
run a command
buffer its entire output in RAM
convert the output into a huge single-line string
compare that string to an empty string
What I would suggest doing instead would be:
run a command
count the characters in its output without storing them
or even better ...
Build tree array from flat array in javascript
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For anyone interested, the code is easily converted to vanilla js: jsfiddle.net/LkkwH/853
– xec
Apr 12 '18 at 9:58
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How do I add BundleConfig.cs to my project?
...elated question: How to add reference to System.Web.Optimization for MVC-3-converted-to-4 app
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Check whether a string contains a substring
...ensitive Substring Example
This is an extension of Eugene's answer, which converts the strings to lower case before checking for the substring:
if (index(lc($str), lc($substr)) != -1) {
print "$str contains $substr\n";
}
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SQL WHERE.. IN clause multiple columns
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While this would work, it converts the uncorrelated query in the question into a correlated query. Unless the query optimizer is clever, this might give you O(n^2) performance :-(. But maybe I'm underestimating the optimizer...
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Use tab to indent in textarea
... spaces instead of a tab? I tried doing   four times but it still converted it into a single space.
– jiaweizhang
Apr 18 '16 at 0:05
6
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How to check whether an array is empty using PHP?
...er(): If no callback is supplied, all entries of array equal to FALSE (see converting to boolean) will be removed.
If you'd like to remove all NULL, FALSE and empty strings (''), but leave zero values (0), you can use strlen as a callback, e.g.:
$is_empty = array_filter($playerlist, 'strlen') == ...
Error java.lang.OutOfMemoryError: GC overhead limit exceeded
...n excessive amount of time (by default 98% of all CPU time of the process) and recovers very little memory in each run (by default 2% of the heap).
This effectively means that your program stops doing any progress and is busy running only the garbage collection at all time.
To prevent your applica...
Using Razor, how do I render a Boolean to a JavaScript variable?
...o use the namespace System.Xml):
var myViewModel = {
isFollowing: @XmlConvert.ToString(Model.IsFollowing)
};
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How do I return multiple values from a function? [closed]
...ing library got the NamedTuple class to make named tuples easier to create and more powerful. Inheriting from typing.NamedTuple lets you use docstrings, default values, and type annotations.
Example (From the docs):
class Employee(NamedTuple): # inherit from typing.NamedTuple
name: str
id...