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How to detect if a variable is an array
What is the best de-facto standard cross-browser method to determine if a variable in JavaScript is an array or not?
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How long do browsers cache HTTP 301s?
I am debugging a problem with a HTTP 301 Permanent Redirect. After a quick test, it seems that Safari clears its cache of 301s when it is restarted, but Firefox does not.
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decimal vs double! - Which one should I use and when? [duplicate]
...cision.
My question is when should a use a double and when should I use a decimal type?
Which type is suitable for money computations? (ie. greater than $100 million)
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What is the best way to programmatically detect porn images? [closed]
Akismet does an amazing job at detecting spam comments. But comments are not the only form of spam these days. What if I wanted something like akismet to automatically detect porn images on a social networking site which allows users to upload their pics, avatars, etc?
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What's the safest way to iterate through the keys of a Perl hash?
... all the keys? I have heard that using each may in some way have unintended side effects. So, is that true, and is one of the two following methods best, or is there a better way?
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传感器组件 · App Inventor 2 中文网
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检测简单步数时(简单步数,距离)
当检测到原始步骤(raw step)时运行此事件。
检测行走步数时(行走步数,距离)
当检测到步行步骤(walking step)时触发此事件。步行步骤是看起来涉及向前运动的步骤。
方法
复位()
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How many double numbers are there between 0.0 and 1.0?
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Upgrading PHP in XAMPP for Windows?
I would like to know how you upgrade PHP in Xampp for Windows? I tried to download the latest PHP version from the main PHP site but when I check (phpinfo) I still get that the previous version is still in use.
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Why use AJAX when WebSockets is available?
...lelism, error handling, etc). Regarding performance, although from-scratch raw large file transfer speed would be similar, browsers have had years to finely tune caching of web content (much of which applies to AJAX requests) so in practice, switching from AJAX to WebSockets is unlikely to provide m...