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What does [].forEach.call() do in JavaScript?
I was looking at some snippets of code, and I found multiple elements calling a function over a node list with a forEach applied to an empty array.
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How can I check if an element exists in the visible DOM?
...f the browser's selecting method, and checking it for a truthy value (generally).
For example, if my element had an id of "find-me", I could simply use...
var elementExists = document.getElementById("find-me");
This is specified to either return a reference to the element or null. If you must ha...
ComponentGroup 组件组扩展：监控内容变化和批量启用禁用组件 · App Inventor 2 中文网
...初始值。触发 AfterContentTouched 事件，组件名称参数为 “-all-“。
设置启用 SetEnable(启用)
启用或禁用 AfterContentTouched 事件的触发。设为 false 可暂时停止内容变化检测。
启用组 EnableGroup(启用)
启用或禁用组中所有已...
What's the difference between MemoryCache.Add and MemoryCache.Set?
I read the MSDN documentation but didn't really understand it.
1 Answer
1
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Android webview slow
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I have noticed that turning off hardware acceleration actually makes my app faster. With android:hardwareAccelerated="true" CSS 3D animations had long delays before they started, scrolling of DIVs inside other scrollable DIVs didn't work, and the app was more unstable.
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How can I read a text file without locking it?
...to explicitly close the stream, as StreamReader.Dispose closes it automatically.
– nothrow
Aug 10 '10 at 11:16
2
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What's the purpose of the LEA instruction?
...ed to support high-level languages like Pascal and C, where arrays—especially arrays of ints or small structs—are common. Consider, for example, a struct representing (x, y) coordinates:
struct Point
{
int xcoord;
int ycoord;
};
Now imagine a statement like:
int y = points[i].ycoor...
Where do gems install?
...r gem environment.
In a terminal run gem env
You should see an entry INSTALLATION DIRECTORY, but there is also GEM PATHS which is where it's loading all your gems from in your current environment.
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How do I overload the square-bracket operator in C#?
... Overloadability
+, -, *, /, %, &, |, <<, >> All C# binary operators can be overloaded.
+, -, !, ~, ++, --, true, false All C# unary operators can be overloaded.
==, !=, <, >, <= , >= All relational operators can be overloaded,
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How to return an NSMutableArray from an NSSet
...
Since -allObjects returns an array, you can create a mutable version with:
NSMutableArray *array = [NSMutableArray arrayWithArray:[set allObjects]];
Or, alternatively, if you want to handle the object ownership:
NSMutableArray *...