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How to find whether or not a variable is empty in Bash
...
if [ ${foo:+1} ]
then
echo "yes"
fi
prints yes if the variable is set. ${foo:+1} will return 1 when the variable is set, otherwise it will return empty string.
...
How to create a jQuery function (a new jQuery method or plugin)?
...ke:
$.fn.myfunction = function () {
console.log(this.length);
};
$('.foo').myfunction();
... will flush to the console the number of elements with the class foo.
Of course, there is a bit more to semantics than that (as well as best practices, and all that jazz), so make sure you read up on...
Error: Jump to case label
...he initialization code belongs to another case.
In the following code, if foo equals 1, everything is ok, but if it equals 2, we'll accidentally use the i variable which does exist but probably contains garbage.
switch(foo) {
case 1:
int i = 42; // i exists all the way to the end of the swit...
Check if property has attribute
...ass Library PCL (like me), then here is how you can do it :)
public class Foo
{
public string A {get;set;}
[Special]
public string B {get;set;}
}
var type = typeof(Foo);
var specialProperties = type.GetRuntimeProperties()
.Where(pi => pi.PropertyType == typeof (string)
...
How do I add files without dots in them (all extension-less files) to the gitignore file?
...iption, but it would only find a match with a
directory. In other words, foo/ will match a directory foo and paths
underneath it, but will not match a regular file or a symbolic link
foo (this is consistent with the way how pathspec works in general in
Git).
...
How to export table as CSV with headings on Postgresql?
...ry from the command line.
psql -U user -d db_name -c "Copy (Select * From foo_table LIMIT 10) To STDOUT With CSV HEADER DELIMITER ',';" > foo_data.csv
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Depend on a branch or tag using a git URL in a package.json?
...tHub URLs
As of version 1.1.65, you can refer to GitHub urls as just "foo":
"user/foo-project". Just as with git URLs, a commit-ish suffix can be
included. For example:
{ "name": "foo",
"version": "0.0.0",
"dependencies": {
"express": "visionmedia/express",
...
google chrome extension :: console.log() from background page?
... page, you can just do:
chrome.extension.getBackgroundPage().console.log('foo');
To make it easier to use:
var bkg = chrome.extension.getBackgroundPage();
bkg.console.log('foo');
Now if you want to do the same within content scripts you have to use Message Passing to achieve that. The reason, ...
Are multiple `.gitignore`s frowned on?
...ntation.
Ignore given files only in given (sub)directory (you can use /sub/foo in .gitignore, though).
Please remember that patterns in .gitignore file apply recursively to the (sub)directory the file is in and all its subdirectories, unless pattern contains '/' (so e.g. pattern name applies to a...
ScalaTest in sbt: is there a way to run a single test without tags?
...(since ScalaTest 2.1.3) within interactive mode:
testOnly *MySuite -- -z foo
to run only the tests whose name includes the substring "foo".
For exact match rather than substring, use -t instead of -z.
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