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Simulating tremor (from e.g. Parkinson's Disease) with the mouse on a webpage?
...ent cursor location: http://jsfiddle.net/benmosher/0x4mc64v/4/
(The normal array is the result of calling rnorm(100) in my R console. Simplest way I could think of in JS to sample a normally-distributed random integer.)
shar...
JPA: How to have one-to-many relation of the same Entity type
....setParent(parent);
daughter.setParent(parent);
parent.setChildren(Arrays.asList(son, daughter));
em.persist(parent);
em.persist(son);
em.persist(daughter);
em.getTransaction().commit();
}
In this case, all three entity instances must be persisted before transaction commi...
Is Java Regex Thread Safe?
...hows a bunch of member variables including the text that is being matched, arrays for groups, a few indexes for maintain location and a few booleans for other state. This all points to a stateful Matcher that would not behave well if accessed by multiple Threads. So does the JavaDoc:
Instance...
Perform debounce in React.js
...at only changes if one of the dependencies has changed.
Passing an empty array as a dependency makes sure the callback is called only once. Here's a simple implementation :
import React, { useCallback } from "react";
import { debounce } from "lodash";
const handler = useCallback(debounce(someFu...
What are the rules about using an underscore in a C++ identifier?
...cs followed by a lowercase letter are reserved
for additional string and array functions.
Names beginning with PRI or SCN followed by any lowercase letter or X are reserved
for additional format specifier macros
Names that end with _t are reserved
for additional type names.
While using th...
C++ auto keyword. Why is it magic?
...t's C base.
#include <iostream>
#include <string>
#include <array>
using namespace std;
void print(auto arg) {
cout<<arg<<" ";
}
int main()
{
string f = "String";//tok assigned
int x = 998;
double a = 4.785;
string b = "C++ Auto !";
//In an opt-code ASCI...
How many socket connections can a web server handle?
...eed 64GB of RAM. If each client needs to read a file, the disk or storage array access load becomes much larger than those devices can handle. If a server needs to fork one process per connection then the OS will spend the majority of its time context switching or starving processes for CPU time.
...
To ARC or not to ARC? What are the pros and cons? [closed]
...tions in dealing with anything that treats an id as a void*. Things like C-arrays of id can take a little more thinking about to do correctly. Fancy handling of ObjC va_args can also cause trouble. Most things involving math on an ObjC pointer is trickier. You shouldn't have much of this in any case...
Requirejs domReady plugin vs Jquery $(document).ready()?
...t is both a plugin and a module. If you include it in the the requirements array w/ a trailing ! your module won't execute until it's "safe" to interact w/ the DOM:
define(['domReady!'], function () {
console.info('The DOM is ready before I happen');
});
Note that loading and executing are di...
Does Haskell require a garbage collector?
...ate dynamic data structures in (say) Fortran by representing them in a big array. It is HORRIBLE ... and not relevant to this discussion.)
The language can provide an explicit free or dispose mechanism. But this relies on the programmer to get it right. Any mistake in the storage management can r...