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How to sum a variable by group

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Why use the params keyword?

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What does “WARN Could not determine content-length of response body.” mean and how to I get rid of i

Since upgrading to Rails 3.1 I'm seeing this warning message in my development log: 9 Answers ...
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What do 'real', 'user' and 'sys' mean in the output of time(1)?

... 2130 Real, User and Sys process time statistics One of these things is not like the other. Real r...
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Why do 64-bit DLLs go to System32 and 32-bit DLLs to SysWoW64 on 64-bit Windows?

... | edited Feb 27 '19 at 2:01 chrki 5,33655 gold badges2727 silver badges5151 bronze badges answe...
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How can I default a parameter to Guid.Empty in C#?

... 241 Solution You can use new Guid() instead public void Problem(Guid optional = new Guid()) { //...
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Why are C character literals ints instead of chars?

In C++, sizeof('a') == sizeof(char) == 1 . This makes intuitive sense, since 'a' is a character literal, and sizeof(char) == 1 as defined by the standard. ...
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Calling a Java method with no name

... 149 This: static { System.out.print("x "); } is a static initialization block, and ...
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Expand/collapse section in UITableView in iOS

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Java HTTPS client certificate authentication

...e to get my particular problem(s) solved; The client's keystore is a PKCS#12 format file containing The client's public certificate (in this instance signed by a self-signed CA) The client's private key To generate it I used OpenSSL's pkcs12 command, for example; openssl pkcs12 -export -in cli...