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Test if remote TCP port is open from a shell script
...ethod for properly testing if a given TCP port is open on a remote server, from inside a Shell script.
16 Answers
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How to prevent blank xmlns attributes in output from .NET's XmlDocument?
When generating XML from XmlDocument in .NET, a blank xmlns attribute appears the first time an element without an associated namespace is inserted; how can this be prevented?
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How can a Java variable be different from itself?
...m.out.println("Not ok");
}
Not ok
You can do the same with Double.NaN.
From JLS §15.21.1. Numerical Equality Operators == and !=:
Floating-point equality testing is performed in accordance with the rules of the IEEE 754 standard:
If either operand is NaN, then the result of == is false but th...
What's the difference between tilde(~) and caret(^) in package.json?
...versions, without incrementing the minor version. ~1.2.3 will use releases from 1.2.3 to <1.3.0.
^version “Compatible with version”, will update you to all future minor/patch versions, without incrementing the major version. ^2.3.4 will use releases from 2.3.4 to <3.0.0.
See Comments be...
How to remove duplicate values from an array in PHP
How can I remove duplicate values from an array in PHP?
24 Answers
24
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namedtuple and default values for optional keyword arguments
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Python 3.7
Use the defaults parameter.
>>> from collections import namedtuple
>>> fields = ('val', 'left', 'right')
>>> Node = namedtuple('Node', fields, defaults=(None,) * len(fields))
>>> Node()
Node(val=None, left=None, right=None)
Or b...
Android studio Gradle build speed up
Since the last update (Build from june 25) any changes in the Android studio Gradle is painfully slow. And it also seems to autotrack changes when you edit the file and recompile on keyup.
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Best approach for designing F# libraries for use from both F# and C#
...m trying to design a library in F#. The library should be friendly for use from both F# and C# .
4 Answers
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Git pull a certain branch from GitHub
... that someone else is working on the project I need to pull their branches from GitHub. It works fine in master. But say that someone created a branch xyz . How can I pull branch xyz from GitHub and merge it into branch xyz on my localhost ?
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Get Image size WITHOUT loading image into memory
...; this function identifies the file, but the actual image data is not read from the file until you try to process the data (or call the load method).
Digging deeper, we see that .open calls _open which is a image-format specific overload. Each of the implementations to _open can be found in a new ...