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How to clean node_modules folder of packages that are not in package.json?

Assume I install project packages with npm install that looks into package.json for modules to be installed. After a while I see that I don't need some specific module and remove its dependency from package.json . Then I remove some other modules from package.json because they are not needed ...
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How does the MapReduce sort algorithm work?

... 1 sampled keys that define the key range for each reduce. In particular, all keys such that sample[i − 1] <= key < sample[i] are sent to reduce i. This guarantees that the output of reduce i are all less than the output of reduce i+1." So their trick is in the way they determine the keys ...
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Questions every good .NET developer should be able to answer? [closed]

...ference type? What does the "readonly" keyword in C# mean? I think it usually helps to ask your applicants to complete a simple coding exercise such as: Write your own linked list class without using the built-in classes. Write your own hashtable class without using the built-in classes. Write a...
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Couldn't register with the bootstrap Server

...r from this by unplugging the iPad, powering it down and back up, clearing all XCode caches and targets, and doing a clean build. I'm running XCode 3.5.4 and iOS 4.2.1 Hope this helps someone. -Mike UPDATE: Same problem running Xcode 4.3 and iOS5 - just power-cycle the device. ...
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What is WEB-INF used for in a Java EE web application?

... within the application hierarchy named WEB-INF. This directory contains all things related to the application that aren’t in the document root of the application. The WEB-INF node is not part of the public document tree of the application. No file contained in the WEB-INF directory may be...
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What is the difference between SQL, PL-SQL and T-SQL?

...e to operate on sets. It is more or less standardized, and used by almost all relational database management systems: SQL Server, Oracle, MySQL, PostgreSQL, DB2, Informix, etc. PL/SQL is a proprietary procedural language used by Oracle PL/pgSQL is a procedural language used by PostgreSQL TSQL is a ...
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How do you set, clear, and toggle a single bit?

... behaviour to shift by more than the width of a long. The same applies to all the rest of the examples. Clearing a bit Use the bitwise AND operator (&) to clear a bit. number &= ~(1UL << n); That will clear the nth bit of number. You must invert the bit string with the bitwise NOT op...
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Why is “while ( !feof (file) )” always wrong?

...ol. The environment truly exists "concurrently" with your program. As with all things concurrent, questions about the "current state" don't make sense: There is no concept of "simultaneity" across concurrent events. Many properties of state simply don't exist concurrently. Let me make this more prec...
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What is an NP-complete in computer science?

...ng machine but also including a non-deterministic "choice" function). Basically, a solution has to be testable in poly time. If that's the case, and a known NP problem can be solved using the given problem with modified input (an NP problem can be reduced to the given problem) then the problem is NP...
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Why is printing to stdout so slow? Can it be sped up?

...ing I decided to look into it and was quite surprised to find that almost all the time spent is waiting for the terminal to process the results. ...