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实时开发、测试和调试工具 · App Inventor 2 中文网
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How to handle Back button with in the dialog?
...ncelListener does not work, and setOnKeyListener works, but for me has the fun side effect that it swallows all keys if your dialog has an edit text.
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How to Select Every Row Where Column Value is NOT Distinct
...mailAddress] must appear in the GROUP BY clause or be used in an aggregate function error. Is the only fix - editing the sql_mode?
– Volodymyr Bobyr
Jul 16 at 16:21
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使用App Inventor扩展实现多点触控：Scale Detector · App Inventor 2 中文网
...，我们实现将手势检测器添加到指定 Canvas 的块：
@SimpleFunction
public void AddHanderToCanvas(Canvas myCanvas) {
this.myCanvas = myCanvas;
ExtensionScaleDetector myDetector =
new ExtensionScaleDetector(myCanvas.getContext(), new MyOnScaleGestureListene...
Determine the number of NA values in a column
... In counting amount of arbitrary value, other than NA is writing a boolean function is.value and then using sum(is.value(df$col)) the way to go or is there a more concise direct syntax for this?
– user3274289
Jun 4 '14 at 2:11
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Getting the first index of an object
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Just for fun this works in JS 1.8.5
var obj = {a: 1, b: 2, c: 3};
Object.keys(obj)[0]; // "a"
This matches the same order that you would see doing
for (o in obj) { ... }
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How do I extract text that lies between parentheses (round brackets)?
...e (sales)", @"\(([^)]*)\)").Groups[1].Value
As a response to the (very funny) comment, here's the same Regex with some explanation:
\( # Escaped parenthesis, means "starts with a '(' character"
( # Parentheses in a regex mean "put (capture) the stuff
# ...
How to check whether a file is empty or not?
...size() and stat() will throw an exception if the file does not exist. This function will return True/False without throwing (simpler but less robust):
import os
def is_non_zero_file(fpath):
return os.path.isfile(fpath) and os.path.getsize(fpath) > 0
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App Inventor 2 试验组件 · App Inventor 2 中文网
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What's the best/easiest GUI Library for Ruby? [closed]
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Shoes is not made for production environment but for fun, it is the "turtle graphic" of Ruby. It is intended for newbies to get acquainted with 1.) domain specific language, 2.) graphics
– karatedog
Feb 2 '12 at 11:58
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