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Java HashMap performance optimization / alternative
.... (Not how Java's String.hashCode works, but I'm just making up a simple example.) If your strings have widely varying lengths, from 1 to 10,000, and are fairly evenly distributed across that range, that this could be a very good hash function. But if your strings are all 1 or 2 characters, this wou...
Are there any O(1/n) algorithms?
...
This question isn't as stupid as it might seem. At least theoretically, something such as O(1/n) is completely sensible when we take the mathematical definition of the Big O notation:
Now you can easily substitute g(x) for 1/x … it's obvious that the above definition still holds for so...
Click button copy to clipboard using jQuery
...d can only be done via a specific user action (like a mouse click). For example, it cannot be done via a timer.
Here's a code example:
document.getElementById("copyButton").addEventListener("click", function() {
copyToClipboard(document.getElementById("copyTarget"));
});
function cop...
How to customize ?
Is it possible to change the appearance of <input type="file"> ?
18 Answers
18...
pdf2htmlEX实现pdf转html - 开源 & Github - 清泛网 - 专注C/C++及内核技术
pdf2htmlEX实现pdf转html首先要感谢pdf2htmlEX的作者Lu Wang，该软件是一个pdf转html的开源软件，效果非常理想。下面两张图片是html和pdf视图下的截图：windows下...首先要感谢pdf2htmlEX的作者Lu Wang，该软件是一个pdf转html的开源软件，效果...
Scala: Abstract types vs generics
... Sommers (May 18, 2009)
Update (October2009): what follows below has actually been illustrated in this new article by Bill Venners:
Abstract Type Members versus Generic Type Parameters in Scala (see summary at the end)
(Here is the relevant extract of the first interview, May 2009, emphasis min...
Seeking clarification on apparent contradictions regarding weakly typed languages
...xamples of programming languages that simply coerce/convert types automatically.
9 Answers
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Delete all the queues from RabbitMQ?
I installed rabbitmqadmin and was able to list all the exchanges and queues. How can I use rabbitmqadmin or rabbitmqctl to delete all the queues.
...
Remove border radius from Select tag in bootstrap 3
...select from the input. Note: appearance is not supported in IE.
Working example: https://jsfiddle.net/gs2q1c7p/
select:not([multiple]) {
-webkit-appearance: none;
-moz-appearance: none;
background-position: right 50%;
background-repeat: no-repeat;
background-image: url...
What does the `#` operator mean in Scala?
...
To explain it, we first have to explain nested classes in Scala. Consider this simple example:
class A {
class B
def f(b: B) = println("Got my B!")
}
Now let's try something with it:
scala> val a1 = new A
a1: A = A@2fa8ecf4
scala&...