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Unable to install gem - Failed to build gem native extension - cannot load such file — mkmf (LoadErr
...ns:
`require': no such file to load -- mkmf (LoadError)
Failed to build gem native extension (mkmf (LoadError)) - Ubuntu 12.04
Usually, the solution is:
sudo apt-get install ruby-dev
Or, if that doesn't work, depending on your ruby version, run something like:
sudo apt-get install rub...
Why does JQuery have dollar signs everywhere?
I am working on a project with quite a lot of JQuery in it. The JQuery has a lot of $ signs everywhere, for example
7 Answ...
How to make a background 20% transparent on Android
How do I make the background of a Textview about 20% transparent (not fully transparent), where there is a color in the background (i.e. white)?
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adding noise to a signal in python
I want to add some random noise to some 100 bin signal that I am simulating in Python - to make it more realistic.
7 Answer...
How do I update each dependency in package.json to the latest version?
I copied package.json from another project and now want to bump all of the dependencies to their latest versions since this is a fresh project and I don't mind fixing something if it breaks.
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How can I remove or replace SVG content?
I have a piece of JavaScript code which creates (using D3.js) an svg element which contains a chart. I want to update the chart based on new data coming from a web service using AJAX, the problem is that each time I click on the update button, it generates a new svg , so I want to remove the old ...
How to detect if a script is being sourced
I have a script where I do not want it to call exit if it's being sourced.
17 Answers
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How to concatenate multiple lines of output to one line?
If I run the command cat file | grep pattern , I get many lines of output. How do you concatenate all lines into one line, effectively replacing each "\n" with "\" " (end with " followed by space)?
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Why are functions in Ocaml/F# not recursive by default?
Why is it that functions in F# and Ocaml (and possibly other languages) are not by default recursive?
6 Answers
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Multiline string literal in C#
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You can use the @ symbol in front of a string to form a verbatim string literal:
string query = @"SELECT foo, bar
FROM table
WHERE id = 42";
You also do not have to escape special characters when you use this method, except for double quotes a...