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What's the nearest substitute for a function pointer in Java?
...ymous inner class
Say you want to have a function passed in with a String param that returns an int.
First you have to define an interface with the function as its only member, if you can't reuse an existing one.
interface StringFunction {
int func(String param);
}
A method that takes the po...
Principles for Modeling CouchDB Documents
...an object in the value that's returned we can use the 'include_docs' query param to include those documents in the map/reduce output:
{"rows":[
{"key":["123412804910820", "post"], "value":null},
{"key":["123412804910820", "author", "Lance1231"], "value":{"_id":"Lance1231"}},
{"key":["12341280...
How do I serialize an object and save it to a file in Android?
...zableManager {
/**
* Saves a serializable object.
*
* @param context The application context.
* @param objectToSave The object to save.
* @param fileName The name of the file.
* @param <T> The type of the object.
*/
public static <T extends Seria...
Can I exclude some concrete urls from inside ?
...alpath.
}
You can if necessary specify the paths-to-be-ignored as an init-param of the filter so that you can control it in the web.xml anyway. You can get it in the filter as follows:
private String pathToBeIgnored;
public void init(FilterConfig config) {
pathToBeIgnored = config.getInitParam...
Can you supply arguments to the map(&:method) syntax in Ruby?
... 5, 7, 9, 11]
But also a lot of other cool stuff, like passing multiple parameters:
arr = ["abc", "babc", "great", "fruit"]
arr.map(&:center.with(20, '*'))
# => ["********abc*********", "********babc********", "*******great********", "*******fruit********"]
arr.map(&:[].with(1, 3))
# ...
Smooth GPS data
...ndroid's sensors to produce a better estimate. The code has a single free parameter Q, expressed in metres per second, which describes how quickly the accuracy decays in the absence of any new location estimates. A higher Q parameter means that the accuracy decays faster. Kalman filters generally...
Need to ZIP an entire directory using Node.js
...s in their code (like me).
const archiver = require('archiver');
/**
* @param {String} source
* @param {String} out
* @returns {Promise}
*/
function zipDirectory(source, out) {
const archive = archiver('zip', { zlib: { level: 9 }});
const stream = fs.createWriteStream(out);
return new P...
Java 256-bit AES Password-Based Encryption
...AES/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, secret);
AlgorithmParameters params = cipher.getParameters();
byte[] iv = params.getParameterSpec(IvParameterSpec.class).getIV();
byte[] ciphertext = cipher.doFinal("Hello, World!".getBytes("UTF-8"));
Store the ciphertext and the iv. On decr...
Is JavaScript a pass-by-reference or pass-by-value language?
...ed call-by-sharing.
In practical terms, this means that if you change the parameter itself (as with num and obj2), that won't affect the item that was fed into the parameter. But if you change the INTERNALS of the parameter, that will propagate back up (as with obj1).
...
AngularJS : Where to use promises?
...nd function consumes the result of the first one:
var firstFn = function(param) {
// do something with param
return 'firstResult';
};
var secondFn = function(param) {
// do something with param
return 'secondResult';
};
secondFn(firstFn());
Now imagine that firstFn and sec...