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Looping in a spiral
...ition in a squared spiral : Fiddle
function spiral(n) {
// given n an index in the squared spiral
// p the sum of point in inner square
// a the position on the current square
// n = p + a
var r = Math.floor((Math.sqrt(n + 1) - 1) / 2) + 1;
// compute radius : inverse arit...
Why do people say that Ruby is slow? [closed]
...at pretty much everything is a method lookup in Ruby - adding two numbers, indexing an array. Where other languages expose hacks (Python's __add__ method, Perl's overload.pm) Ruby does pure OO in all cases, and this can hurt performance if the compiler/interpreter is not clever enough.
If I were wr...
What is array to pointer decay?
...r to int. That pointer can be compared with the variable ip.
In the array indexing syntax you are used to seeing, again, the arr is 'decayed to a pointer'
arr[42];
/* same as *(arr + 42); */
/* same as *(&(arr[0]) + 42); */
The only times an array doesn't decay into a pointer are when it is ...
When exactly are onSaveInstanceState() and onRestoreInstanceState() called?
...s that mean if we try to access a view (to get some value to save, like an index from a listview) we might run into NullPointerExceptions?
– Tiago
Feb 23 '15 at 21:56
...
Can a C# class inherit attributes from its interface?
...xisting type (to avoid duplication), but it is only valid for property and indexer usage.
As an example:
using System;
using System.ComponentModel;
class Foo {
[AttributeProvider(typeof(IListSource))]
public object Bar { get; set; }
static void Main() {
var bar = TypeDescripto...
Git pull without checkout?
......?
What if you're on some branch (e.g., C) and the work directory and/or index are modified but not committed?
What if the remote repo has new branches added (A) and/or branches deleted (D)?
If the answer to (1) is "because devhost is not actually for development, but rather is a local mirror th...
Why is the JVM stack-based and the Dalvik VM register-based?
...ry few registers, like just an accumulator and maybe one or two pointer or index registers, but that's still more like a register machine in the theory-of-computation sense. But we're talking about VMs that are interpreted, so the "register file" if there is one would actually be in memory. Unless...
How do I apply a perspective transform to a UIView?
... do the following:
Objective-C
UIView *myView = [[self subviews] objectAtIndex:0];
CALayer *layer = myView.layer;
CATransform3D rotationAndPerspectiveTransform = CATransform3DIdentity;
rotationAndPerspectiveTransform.m34 = 1.0 / -500;
rotationAndPerspectiveTransform = CATransform3DRotate(rotationA...
How do I get the real .height() of a overflow: hidden or overflow: scroll div?
... box-shadow: inset 0 -26px 22px -17px #fff;
height: 39px;
z-index:99999;
width:100%;
opacity:1;
}
.showMore::after {opacity:0;}
.more {border-top:1px solid gray;width:400px;color:blue;cursor:pointer;}
.more.less {border-color:#fff;
}
<script src="https://ajax.googleapis...
How to revert a Git Submodule pointer to the commit stored in the containing repository?
...es, i.e. clone missing submodules and
checkout the commit specified in the index of the containing
repository. This will make the submodules HEAD be detached unless
--rebase or --merge is specified or the key submodule.$name.update
is set to rebase or merge.
Run this and all should be well:
git sub...