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Validating IPv4 addresses with regexp
...t also leads to difficulties with verification/security as 023 needs to be converted to 23 to avoid duplicates, etc. Thanks for trying to make things better !
– Danail Gabenski
Dec 27 '19 at 1:03
...
How to check for an undefined or null variable in JavaScript?
... property doesn't yield an error and simply returns undefined, which, when converted to a boolean, evaluates to false. So, if you don't care about
0 and false, using if(obj.undefProp) is ok. There's a common idiom based on this fact:
value = obj.prop || defaultValue
which means "if obj has the p...
How can I play sound in Java?
...
clip.start();
} catch (Exception e) {
System.err.println(e.getMessage());
}
}
}).start();
}
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How exactly does the android:onClick XML attribute differ from setOnClickListener?
... more code
public void myFancyMethod(View v) {
// does something very interesting
}
Above is a code implementation of an OnClickListener. And this is the XML implementation.
XML Implementation
<?xml version="1.0" encoding="utf-8"?>
<!-- layout elements -->
<Button android:id=...
What is the easiest way to parse an INI file in Java?
...s that the ini files that the older application used have to be read as-is into the new Java Application. The format of this ini files is the common windows style, with header sections and key=value pairs, using # as the character for commenting.
...
MySQL “incorrect string value” error when save unicode string in Django
...
results = cursor.fetchall()
for row in results:
sql = "ALTER TABLE `%s` convert to character set DEFAULT COLLATE DEFAULT" % (row[0])
cursor.execute(sql)
db.close()
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How do you produce a .d.ts “typings” definition file from an existing JavaScript library?
...ucco-and-Luke-Hoban-Inside-TypeScript at 00:33:52 they had built a tool to convert WebIDL and WinRT metadata into TypeScript d.ts
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How to use a variable for a key in a JavaScript object literal?
... 'theTop' : 10 }
The PropertyName theTop is an IdentifierName, so it gets converted to the 'theTop' string value, which is the string value of 'theTop'.
It is not possible to write object initializers (literals) with variable keys.
The only three options are IdentifierName (expands to string liter...
Creating a byte array from a stream
...e[16*1024];
using (MemoryStream ms = new MemoryStream())
{
int read;
while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
{
ms.Write(buffer, 0, read);
}
return ms.ToArray();
}
}
With .NET 4 and above, I'd use Stream.CopyTo, wh...
Format in kotlin string templates
...at(n) function you'd need to define yourself as
fun Double.format(digits: Int) = "%.${digits}f".format(this)
There's clearly a piece of functionality here that is missing from Kotlin at the moment, we'll fix it.
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