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What is JavaScript garbage collection?
...for a web programmer to understand about JavaScript garbage collection, in order to write better code?
9 Answers
...
How do you cast a List of supertypes to a List of subtypes?
...cast(a));
}
}
return listB;
}
This method can be used in order to filter arbitrary lists (not only with a given Subtype-Supertype relationship regarding the type parameters), as in this example:
// A list of type "List<Number>" that actually
// contains Integer, Double and ...
What are the differences between a clustered and a non-clustered index?
...le
Faster to read than non clustered as data is physically stored in index order
Non Clustered Index
Can be used many times per table
Quicker for insert and update operations than a clustered index
Both types of index will improve performance when select data with fields that use the index but...
Rails “validates_uniqueness_of” Case Sensitivity
...hreaded server. That's because you might get this sequence of events (the order is important):
Process A gets a request to create a new user with the name 'foo'
Process B does the same thing
Process A validates the uniqueness of 'foo' by asking the DB if that name exists yet and the DB says the n...
Is python's sorted() function guaranteed to be stable?
..., 1), (1, 2)] instead of returning the original input in the same sequence/order. Shouldn't the guarantee of stability mean that it should be returning the original [(1, 2), (1, 1)] input? In that case, you have be explicit and say sorted([(1, 2), (1, 1)], key=lambda t: t[0])
–...
Unusual shape of a textarea?
...ht of the main div:
As you can see, you have to play a little with the borders if you want the same result as you requested in your post. The main div has the blue border on every side. Next, red blocks has to be sticked to hide top borders of the main div, and you need to apply border to them on...
HTML input - name vs. id [duplicate]
...tup:
<input id="message_id" name="message_name" type="text" />
in order to get the value with PHP when posting your form, it will use the name-attribute, like this:
$_POST["message_name"];
The id is used for styling, as said before, for when you want to use specific css.
#message_id
{
...
What is the best way to give a C# auto-property an initial value?
...ublic string Name { get; set; }
}
As this gives you clear control of the order values are assigned.
As of C#6 there is a new way:
public string Name { get; set; } = "Default Name";
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impr...
WiX tricks and tips
... <Publish Dialog ="ExitDialog"
Control ="Finish"
Order ="1"
Event ="DoAction"
Value ="CA.StartAppOnExit">WIXUI_EXITDIALOGOPTIONALCHECKBOXTEXT</Publish>
</UI>
If you do it this way, the "standard" appearance isn't quite right. ...
My docker container has no internet
...
First thing to check is run cat /etc/resolv.conf in the docker container. If it has an invalid DNS server, such as nameserver 127.0.x.x, then the container will not be able to resolve the domain names into ip addresses, so ping google.com will fail.
Second ...