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How is the java memory pool divided?

... data area from which the Java VM allocates memory for all class instances and arrays. The heap may be of a fixed or variable size. The garbage collector is an automatic memory management system that reclaims heap memory for objects. Eden Space: The pool from which memory is initially allocated fo...
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Multi-Line Comments in Ruby?

...egin Every body mentioned this way to have multiline comments. The =begin and =end must be at the beginning of the line or it will be a syntax error. =end puts "Hello world!" <<-DOC Also, you could create a docstring. which... DOC puts "Hello world!" "..is kinda ugly and creates a String ...
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What are Long-Polling, Websockets, Server-Sent Events (SSE) and Comet?

... In the examples below the client is the browser and the server is the webserver hosting the website. Before you can understand these technologies, you have to understand classic HTTP web traffic first. Regular HTTP: A client requests a webpage from a server. The server...
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Using the star sign in grep

...ou need to tell it what you repeat. /*abc*/ matches a string containing ab and zero or more c's (because the second * is on the c; the first is meaningless because there's nothing for it to repeat). If you want to match anything, you need to say .* -- the dot means any character (within certain guid...
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Callback after all asynchronous forEach callbacks are completed

...=== array.length) { callback(); } }); }); (thanks to @vanuan and others) This approach guarantees that all items are processed before invoking the "done" callback. You need to use a counter that gets updated in the callback. Depending on the value of the index parameter does not provid...
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How to check if an element is in an array

...y? Xcode does not have any suggestions for contain , include , or has , and a quick search through the book turned up nothing. Any idea how to check for this? I know that there is a method find that returns the index number, but is there a method that returns a boolean like ruby's #include? ? ...
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How to get index using LINQ? [duplicate]

... edited Dec 30 '16 at 7:15 Andrew Savinykh 21.2k1212 gold badges8383 silver badges138138 bronze badges answered Mar 18 '10 at 16:35 ...
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How can I save a screenshot directly to a file in Windows? [closed]

... You can code something pretty simple that will hook the PrintScreen and save the capture in a file. Here is something to start to capture and save to a file. You will just need to hook the key "Print screen". using System; using System.Drawing; using System.IO; using System.Drawing.Imaging;...
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How to use shared memory with Linux in C

... There are two approaches: shmget and mmap. I'll talk about mmap, since it's more modern and flexible, but you can take a look at man shmget (or this tutorial) if you'd rather use the old-style tools. The mmap() function can be used to allocate memory buffer...
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What's the difference between design patterns and architectural patterns?

...ou find in programs. It allows us to deconstruct a large complex structure and build using simple parts. It provides a general solution for a class of problems. A large complex software goes through a series of deconstruction at different levels. At large level, architectural patterns are the tool...