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How do I get the current absolute URL in Ruby on Rails?
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33 Answers
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Print a list in reverse order with range()?
...parameters. range(start, stop, step)
For example, to generate a list [5,4,3,2,1,0], you can use the following:
range(5, -1, -1)
It may be less intuitive but as the comments mention, this is more efficient and the right usage of range for reversed list.
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How to pass optional arguments to a method in C++?
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AustinWBryan
2,86133 gold badges1616 silver badges3535 bronze badges
answered Sep 24 '10 at 4:07
Pramendra GuptaPramend...
How to throw std::exceptions with variable messages?
...};
Example:
throw std::runtime_error(Formatter() << foo << 13 << ", bar" << myData); // implicitly cast to std::string
throw std::runtime_error(Formatter() << foo << 13 << ", bar" << myData >> Formatter::to_str); // explicitly cast to std...
Retrieve only the queried element in an object array in MongoDB collection
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db.test.find({"shapes.color": "red"}, {_id: 0, 'shapes.$': 1});
MongoDB 3.2 Update
Starting with the 3.2 release, you can use the new $filter aggregation operator to filter an array during projection, which has the benefit of including all matches, instead of just the first one.
db.test.aggrega...
How do you sort an array on multiple columns?
...cation name for tiebreaker.
function mysortfunction(a, b) {
var o1 = a[3].toLowerCase();
var o2 = b[3].toLowerCase();
var p1 = a[1].toLowerCase();
var p2 = b[1].toLowerCase();
if (o1 < o2) return -1;
if (o1 > o2) return 1;
if (p1 < p2) return -1;
if (p1 > p2) return 1...
Can someone explain the right way to use SBT?
...b. For instance http://mvnrepository.com/artifact/net.sf.opencsv/opencsv/2.3 indicates to use:
libraryDependencies += "net.sf.opencsv" % "opencsv" % "2.3"
Then pull out the machette and start hacking your way forward. If you are lucky you don't end up using jars that depends on some of the same j...
Combine two data frames by rows (rbind) when they have different sets of columns
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13 Answers
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How to add reference to System.Web.Optimization for MVC-3-converted-to-4 app
...to use the new bundling feature in a project I recently converted from MVC 3 to MVC 4 beta. It requires a line of code in global.asax, BundleTable.Bundles.RegisterTemplateBundles(); , which requires using System.Web.Optimization; at the top.
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