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How to tell if node.js is installed or not

I've recently installed node.js and I have no idea how to run applications. I installed node.js but couldn't find further instructions. What does one really need to do? I wanted to see if it was actually working. So I executed a script called hello.js. It went as such: ...
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git error: failed to push some refs to remote

For some reason, I can't push now, whereas I could do it yesterday. Maybe I messed up with configs or something. 39 Answers...
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How do I force make/GCC to show me the commands?

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C++ performance challenge: integer to std::string conversion

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How do I parse a string to a float or int?

In Python, how can I parse a numeric string like "545.2222" to its corresponding float value, 545.2222 ? Or parse the string "31" to an integer, 31 ? ...
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Postgresql: password authentication failed for user “postgres”

I have installed PostgreSQL 8.4, Postgres client and Pgadmin 3. Authentication failed for user "postgres" for both console client and Pgadmin. I have typed user as "postgres" and password "postgres", because it worked before. But now authentication is failed. I did it before a couple of times withou...
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How do I Geocode 20 addresses without receiving an OVER_QUERY_LIMIT response?

Using the Google Geocoder v3, if I try to geocode 20 addresses, I get an OVER_QUERY_LIMIT unless I time them to be ~1 second apart, but then it takes 20 seconds before my markers are all placed. ...
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What is Java Servlet?

I read many articles to understand java servlet but I did not succeed. 12 Answers 12 ...
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Best way to convert strings to symbols in hash

What's the (fastest/cleanest/straightforward) way to convert all keys in a hash from strings to symbols in Ruby? 31 Answers...
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Reverse of JSON.stringify?

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