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Show SOME invisible/whitespace characters in Eclipse

...ll pick it up. The text component in Eclipse is very complicated as it is and they are not keen on making them even worse. [UPDATE] This has been fixed in Eclipse 3.7: Go to Window > Preferences > General > Editors > Text Editors Click on the link "whitespace characters" to fine tune ...
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What is non-blocking or asynchronous I/O in Node.js?

...rage is a blocking operation as it stalls execution to read. On the other hand, fetch is a non-blocking operation as it does not stall alert(3) from execution. // Blocking: 1,... 2 alert(1); var value = localStorage.getItem('foo'); alert(2); // Non-blocking: 1, 3,... 2 alert(1); fetch('example.com...
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Java: How to set Precision for double value? [duplicate]

I was working with numbers recently and I had a situation where I want to set the precision of a double value say to 6 digits or 4 digits, depending on the value stored in the database. ...
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What is the theoretical maximum number of open TCP connections that a modern Linux box can have

...a '64K' limit that is often cited, but that is per client per server port, and needs clarifying. Each TCP/IP packet has basically four fields for addressing. These are: source_ip source_port destination_ip destination_port < client > < server > Inside the...
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What are 'closures' in .NET?

... The general feature of closures is implemented in C# by anonymous methods and lambda expressions. Here's an example using an anonymous method: using System; class Test { static void Main() { Action action = CreateAction(); action(); action(); } static Act...
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Rails: around_* callbacks

...api.rubyonrails.org/classes/ActiveRecord/Callbacks.html , but don't understand when the around_* callbacks are triggered in relation to before_* and after_* . ...
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Transaction isolation levels relation with locks on table

... I want to understand the lock each transaction isolation takes on the table For example, you have 3 concurrent processes A, B and C. A starts a transaction, writes data and commit/rollback (depending on results). B just executes a SELECT st...
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Writing to an Excel spreadsheet

... to write some data from my program to a spreadsheet. I've searched online and there seem to be many packages available (xlwt, XlsXcessive, openpyxl). Others suggest to write to a .csv file (never used CSV and don't really understand what it is). ...
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Fade In Fade Out Android Animation in Java

... to have a 2 second animation of an ImageView that spends 1000ms fading in and then 1000ms fading out. 11 Answers ...
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How to ignore files which are in repository?

... @Nimbus147: it shouldn't be an issue, and any changes on that file will still be ignored (ie not added/committed). – VonC Aug 29 '11 at 16:57 ...