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How to detect if a function is called as constructor?
... x as a function, unless you assign a property to every new object created by x as it is constructed:
function x(y) {
var isConstructor = false;
if (this instanceof x // <- You could use arguments.callee instead of x here,
// except in in EcmaScript 5 strict mod...
ruby inheritance vs mixins
In Ruby, since you can include multiple mixins but only extend one class, it seems like mixins would be preferred over inheritance.
...
Best implementation for hashCode method for a collection
....
For every field f tested in the equals() method, calculate a hash code c by:
If the field f is a boolean:
calculate (f ? 0 : 1);
If the field f is a byte, char, short or int: calculate (int)f;
If the field f is a long: calculate (int)(f ^ (f >>> 32));
If the field f is a float: calcula...
How to get the function name from within that function?
...slightly better choice than hardcoding the string.
– byxor
Dec 4 '19 at 11:49
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Android: How can I get the current foreground activity (from a service)?
...rvice.
You can request a maximum number of tasks running on the phone, and by default, the currently active task is returned first.
Once you have that you can get a ComponentName object by requesting the topActivity from your list.
Here's an example.
ActivityManager am = (ActivityManager) thi...
When exactly is it leak safe to use (anonymous) inner classes?
... smart, but not flawless. It can only determine if something is being used by whether or not there is an active reference to the object.
The real issue here is when a inner class has been kept alive longer than its container. This is because of the implicit reference to the containing class. The o...
Delete specific line number(s) from a text file using sed?
...
You can delete a particular single line with its line number by
sed -i '33d' file
This will delete the line on 33 line number and save the updated file.
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What is the difference between a directory and a folder?
... the term "Folder" as part of its "desktop metaphor", this was popularized by the 1980's Mac, and became universal in later GUIs including Windows. But at the command line, it's still a "directory".
– Orion Lawlor
Aug 28 at 7:28
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Daylight saving time and time zone best practices [closed]
...ime, persist the time according to a unified standard that is not affected by daylight savings. (GMT and UTC are equivalent with this regard, but it is preferred to use the term UTC. Notice that UTC is also known as Zulu or Z time.)
If instead you choose to persist a time using a local time value, i...
How do I create a slug in Django?
...ify("b b b b")
u'b-b-b-b'
>>>
You can call slugify automatically by overriding the save method:
class Test(models.Model):
q = models.CharField(max_length=30)
s = models.SlugField()
def save(self, *args, **kwargs):
self.s = slugify(self.q)
super(Test, self)....