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Test if something is not undefined in JavaScript
...defined", instead of a useful message about an "un-caught exception @ line 123 of file xyz.js". Eventually a second developer will probably comment out the console.log() statement, making it more difficult for a 3rd developer to come in and fix a bug happening deep within doSomething().
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Delete directories recursively in Java
...rn FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException {
Files.delete(dir);
return FileVisitResult.CONTINUE;
}
});
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站长投放广告绝对不做的事:Google Adsense和百度联盟广告违规分析 - 更多技...
...是非常不利的。
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How do you configure Django for simple development and deployment?
...ent, but on a live server something more robust is
often needed ( MySQL / PostgreSQL , for example).
Invariably, there are other changes to make to the Django
settings as well: different logging locations / intensities,
media paths, etc.
...
max value of integer
...(otherwise it is reserved for the sign bit).
Here's a short table of the possible values for the possible data types:
width minimum maximum
signed 8 bit -128 +127
signed 16 bit ...
Convert datetime to Unix timestamp and convert it back in python
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@J.F.Sebastian: I didn't want to cover all of the three possibilities in detail, but I guess you're right, I should.
– abarnert
Nov 6 '13 at 0:52
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JavaScript validation for empty input field
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123
<script type="text/javascript">
function validateForm() {
var a = document.f...
When should I use mmap for file access?
POSIX environments provide at least two ways of accessing files. There's the standard system calls open() , read() , write() , and friends, but there's also the option of using mmap() to map the file into virtual memory.
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Ideal way to cancel an executing AsyncTask
...s thats right, but this way background thread doesn't get interrupted, suppose the case when uploading image, the uploading process continues in background and we didn't get onPostExecute called.
– umesh
Jan 21 '14 at 13:04
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App Inventor 2 低功耗蓝牙(BLE) 硬件接入、数据通信及IO控制 · App Inventor 2 中文网
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