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How to find keys of a hash?
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There is function in modern JavaScript (ECMAScript 5) called Object.keys performing this operation:
var obj = { "a" : 1, "b" : 2, "c" : 3};
alert(Object.keys(obj)); // will output ["a", "b", "c"]
Compatibility details can be found here.
On the Mozilla site there is also a s...
Create directories using make file
... solution also has the significant drawback that the mkdir process will be called by the make file for every single file that's rebuilt, most of which won't need to make the directory again. When adapted to non-Linux build systems like Windows, it actually causes both an unblockable error output si...
How to get C# Enum description from value? [duplicate]
...ons.GetEnumDescription 's Enum value parameter to this Enum value and then call it like string description = ((MyEnum)value).GetEnumDescription()
– gkc
Nov 25 '14 at 14:09
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汇编语言超浓缩教程（汇编入门必备） - C/C++ - 清泛网 - 专注C/C++及内核技术
...般的程序是由 DEBUG 直接调用的，所以用 INT 20 返回，用 CALL 指令所调用的程序则改用返回指令RET,RET会把控制权转移到栈顶所指的地址，而该地址是由调用此程序的 CALL指令所放入的。
各模块都搞定了，然后我们把子程序组...
How do pointer to pointers work in C?
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Stephan did a good job reproducing, basically, the diagram in Kernighan & Richie's The C Programming Language. If you're programming C, and don't have this book and are cool with paper documentation, I highly suggest you get it, the (fairly) modest expense wil...
In Objective-C why should I check if self = [super init] is not nil?
...untime such that NSObject's implementation of init is not what is actually called.
– bbum
Jul 9 at 5:04
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How to make a round button?
...n round circle. It's not the same. Please, tell me, is it possible on Android? Thank you.
15 Answers
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How to detect a Christmas Tree? [closed]
...st both be above 0.7. The results of the two threshold procedures are logically "or"-ed together, and the resulting matrix of black-and-white binary images is shown below:
You can clearly see that each image has one large cluster of pixels roughly corresponding to the location of each tree, plus...
Determine which element the mouse pointer is on top of in JavaScript
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DEMO
There's a really cool function called document.elementFromPoint which does what it sounds like.
What we need is to find the x and y coords of the mouse and then call it using those values:
var x = event.clientX, y = event.clientY,
elementMouseIsOver ...
How to resize a tableHeaderView of a UITableView?
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+1 This worked for me. Calling 'setTableHeaderView' after your subview has changed size is the key. The problem is, my subview changes size over a second as an animation. Now I'm trying to figure out how to animate the tableHeaderView with it.
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