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What does map(&:name) mean in Ruby?
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It's shorthand for tags.map(&:name.to_proc).join(' ')
If foo is an object with a to_proc method, then you can pass it to a method as &foo, which will call foo.to_proc and use that as the method's block.
The Symbol#to_proc meth...
How do I check if an HTML element is empty using jQuery?
...empty')){
//do something
}
for more info see http://api.jquery.com/is/ and http://api.jquery.com/empty-selector/
EDIT:
As some have pointed, the browser interpretation of an empty element can vary. If you would like to ignore invisible elements such as spaces and line breaks and make the imple...
Difference between json.js and json2.js
...mented.
// These forms are obsolete. It is recommended that JSON.stringify and
// JSON.parse be used instead.
if (!Object.prototype.toJSONString) {
Object.prototype.toJSONString = function (filter) {
return JSON.stringify(this, filter);
};
Object.prototype.parseJSON = function (...
Undo working copy modifications of one file in Git?
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what's the difference between HEAD and HEAD^?
– hasen
Mar 28 '09 at 22:06
63
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Give all the permissions to a user on a DB
...ng it an admin.
The reason why I want to do that is that at the moment DEV and PROD are different DBs on the same cluster so I don't want a user to be able to change production objects but it must be able to change objects on DEV.
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What does rake db:test:prepare actually do?
I am following the rails tutorial videos and I can't figure out what the db:test:prepare command actually does. Can someone provide an explanation?
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How can I grep for a string that begins with a dash/hyphen?
...with a dash/hyphen, like -X , in a file, but it's confusing this as a command line argument.
10 Answers
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How do you sort a dictionary by value?
...consisting of keys & values, by value. For example, I have a hash of words and respective frequencies, that I want to order by frequency.
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Choosing a file in Python with simple Dialog
...ow from appearing
filename = askopenfilename() # show an "Open" dialog box and return the path to the selected file
print(filename)
Done!
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follo...
Case preserving substitute in Vim
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We do not deserve Tim Pope.
– Andrew Keeton
May 23 '19 at 19:47
1
This plu...