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What does jquery $ actually return?
...r or not it has any contents is the question. Typically you can check this by using .val() (e.g. $('.myElem').val())
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Why does the JVM still not support tail-call optimization?
...ation from tail-recursive function to simple loop must be done dynamically by a JIT compiler.
It then gives an example of Java code that won't transform.
So, as the example in Listing 3 shows, we cannot expect static compilers to perform transformation of tail recursion on Java code while pre...
How to get a key in a JavaScript object by its value?
...
function getKeyByValue(object, value) {
return Object.keys(object).find(key => object[key] === value);
}
ES6, no prototype mutations or external libraries.
Example,
function getKeyByValue(object, value) {
return Object.keys(...
MySQL COUNT DISTINCT
...ite
From cp_visits
Where ts >= DATE_SUB(NOW(), INTERVAL 1 DAY)
Group By site_id
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gitignore all files of extension in directory
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It would appear that the ** syntax is supported by git as of version 1.8.2.1 according to the documentation.
Two consecutive asterisks ("**") in patterns matched against full pathname may have special meaning:
A leading "**" followed by a slash means match in a...
Should IBOutlets be strong or weak under ARC?
...t to a subview or to
a constraint that's not always going to be retained by the view
hierarchy. The only time you really need to make an outlet weak is if
you have a custom view that references something back up the view
hierarchy and in general that's not recommended.
I asked about this o...
Dependency Inject (DI) “friendly” library
...all the DI Container, it'll call you.
Never directly ask for a dependency by calling a container from within your code. Ask for it implicitly by using Constructor Injection.
Use Constructor Injection
When you need a dependency, ask for it statically through the constructor:
public class Service ...
Scala vs. Groovy vs. Clojure [closed]
...think it is a language with limited utility, particularly as Jython and JRuby start making inroads on the JVM-land, compared to the others.
Clojure, even discounting some very interesting features, has a strong appeal just by being a Lisp dialect on JVM. It might limit its popularity, granted, but ...
Which characters make a URL invalid?
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In general URIs as defined by RFC 3986 (see Section 2: Characters) may contain any of the following 84 characters:
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-._~:/?#[]@!$&'()*+,;=
Note that this list doesn't state where in t...
Get PHP class property by string
...iable in an array-like way, but you want the flexibility and power offered by objects. If a class implements ArrayAccess, Countable, and one of the iterator interfaces, it's mostly indistinguishable from a normal array()
– Peter Bailey
May 13 '15 at 13:06
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