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How to make input type= file Should accept only pdf and xls

... You could do so by using the attribute accept and adding allowed mime-types to it. But not all browsers do respect that attribute and it could easily be removed via some code inspector. So in either case you need to check the file type on the server side (your second que...
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When is “i += x” different from “i = i + x” in Python?

I was told that += can have different effects than the standard notation of i = i + . Is there a case in which i += 1 would be different from i = i + 1 ? ...
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How to convert java.util.Date to java.sql.Date?

I am trying to use a java.util.Date as input and then creating a query with it - so I need a java.sql.Date . 18 Answer...
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Does every Core Data Relationship have to have an Inverse?

Let's say I have two Entity classes: SocialApp and SocialAppType 8 Answers 8 ...
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SortedList, SortedDictionary and Dictionary

...at SortedList<TKey, TValue> SortedDictionary<TKey, TValue> and Dictionary<TKey, TValue> implement the same interfaces. ...
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difference between socket programming and Http programming

What is the difference between socket programming and Http programming? can anyone help please? 5 Answers ...
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node.js database [closed]

...r of the mongodb driver for node.js. I'm using mongodb for my own projects and have been very happy with the performance of mongodb. Mongodb driver for node.js (Shameless plug) Feel free to ask any questions about the driver at Google group for the mongodb driver or here at Stackoverflow Have f...
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How expensive is RTTI?

I understand that there is a resource hit from using RTTI, but how big is it? Everywhere I've looked just says that "RTTI is expensive," but none of them actually give any benchmarks or quantitative data reguarding memory, processor time, or speed. ...
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Does bit-shift depend on endianness?

... equivalent of converting to big endian, the shifting operation comes next and then the new value is stored back in memory, which is where the little endian byte order comes into effect again. Update, thanks to @jww: On PowerPC the vector shifts and rotates are endian sensitive. You can have a val...
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Adding a directory to $LOAD_PATH (Ruby)

...y because I've seen much more usage of it in code than the $LOAD_PATH one, and it's shorter too! share | improve this answer | follow | ...