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nodeJs callbacks simple example
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var usingItNow = function(callback) {
callback(null, 'get it?'); // I dont want to throw an error, so I pass null for the error argument
};
If we want to simulate an error case, we can define usingItNow like this
var usingItNow = function(callback) {
var myError = new Error('My custom erro...
Change the name of a key in dictionary
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Easily done in 2 steps:
dictionary[new_key] = dictionary[old_key]
del dictionary[old_key]
Or in 1 step:
dictionary[new_key] = dictionary.pop(old_key)
which will raise KeyError if dictionary[old_key] is undefined. Note that thi...
What are “Groovy” and “Grails” and what kinds of applications are built using them?
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What is Groovy on Grails?
It doesn't exist under this name anymore. It's simply called Grails now.
What is Groovy?
Originally, a dynamic language for the JVM. However, since Groovy 2.0, both static and dynamic typing are supported.
What is Grails?
Grai...
List directory tree structure in python?
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Here's a function to do that with formatting:
import os
def list_files(startpath):
for root, dirs, files in os.walk(startpath):
level = root.replace(startpath, '').count(os.sep)
indent = ' ' * 4 * (level)
print('{}{}...
Force Java timezone as GMT/UTC
...at the value stored in the database is consistent when the database column does not keep timezone information.
The java.util.Date and java.sql.Date classes store the actual time (milliseconds) in UTC. To format these on output to another timezone, use SimpleDateFormat. You can also associate a time...
Fastest way to extract frames using ffmpeg?
...need to extract frames from videos using ffmpeg.. Is there a faster way to do it than this:
6 Answers
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Renaming or copying files and folder using NERDTree on Vim. Is it possible?
I checked the documentation and I couldn't find a way o renaming or copying files and folder using NERDTree. Is it possible?
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How can I make XSLT work in chrome?
I have an XML document here that is served with a corresponding XSL file . The transformation is left to be executed client-side, without JavaScript.
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Boolean.hashCode()
...ly large) arbitrary prime numbers. Any other two large prime numbers would do fine.
Why primes?
Suppose for a second that we picked composite numbers (non-primes), say 1000 and 2000. When inserting booleans into a hash table, true and false would go into bucket 1000 % N resp 2000 % N (where N is th...
How to hide underbar in EditText
...itText fields. Modify it to strip out the underbar and other graphics you don't want. With this, your modified EditText will have the same margins and overall appearance as normal EditText fields. If you simply set the background to null, it will lose the margins.
– Peri Har...