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How to remove a key from Hash and get the remaining hash in Ruby/Rails?
... method that returns the hash with those keys removed. If you're already using Rails, there's no sense in creating your own version of this.
class Hash
# Returns a hash that includes everything but the given keys.
# hash = { a: true, b: false, c: nil}
# hash.except(:c) # => { a: true,...
How do you convert an entire directory with ffmpeg?
How do you convert an entire directory/folder with ffmpeg via command line or with a batch script?
24 Answers
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Is there a fixed sized queue which removes excessive elements?
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There is no existing implementation in the Java Language and Runtime. All Queues extend AbstractQueue, and its doc clearly states that adding an element to a full queue always ends with an exception. It would be best ( and quite simple ) to w...
Why does instanceof return false for some literals?
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Primitives are a different kind of type than objects created from within Javascript. From the Mozilla API docs:
var color1 = new String("green");
color1 instanceof String; // returns true
var color2 = "coral";
color2 instanceof String; // returns false...
Why doesn't a python dict.update() return the object?
I 'm trying to do :
10 Answers
10
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How do you determine what technology a website is built on? [closed]
Quite often I come across a nice looking or functional website, and wonder what technology was used to create it. What techniques are available to figure out what a
particular website was built with?
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How do I tar a directory of files and folders without including the directory itself?
... && tar -zcvf ../my_dir.tgz . && cd -
should do the job in one line. It works well for hidden files as well. "*" doesn't expand hidden files by path name expansion at least in bash. Below is my experiment:
$ mkdir my_directory
$ touch my_directory/file1
$ touch my_directory/file2...
SSH configuration: override the default username [closed]
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Create a file called config inside ~/.ssh. Inside the file you can add:
Host *
User buck
Or add
Host example
HostName example.net
User buck
The second example will set a username and is hostname specific, while the first example sets a...
Easiest way to flip a boolean value?
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the two cases can be merged as they do the same thing.
– David Allan Finch
Mar 4 '09 at 15:16
1
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How to order citations by appearance using BibTeX?
By default (using the plain style) BibTeX orders citations alphabetically.
12 Answers
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