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Difference between JSON.stringify and JSON.parse
... // '{}'
JSON.stringify(true); // 'true'
JSON.stringify('foo'); // '"foo"'
JSON.stringify([1, 'false', false]); // '[1,"false",false]'
JSON.stringify({ x: 5 }); // '{"x":5}'
JSON.stringify(new Date(2006, 0, 2, 15, 4, 5))
// '"2006-01-02T15:04:05.000Z"'
J...
How can I get the ID of an element using jQuery?
...'#test').prop('id')
which is different from .attr() and $('#test').prop('foo') grabs the specified DOM foo property, while $('#test').attr('foo') grabs the specified HTML foo attribute and you can find more details about differences here.
...
Empty set literal?
...r check if the length is 0.
example:
#create a new set
a=set([1,2,3,'foo','bar'])
#or, using a literal:
a={1,2,3,'foo','bar'}
#create an empty set
a=set()
#or, use the clear method
a.clear()
#comparison to a new blank set
if a==set():
#do something
#length-checking comparison
if len(a)=...
Isn't “package private” member access synonymous with the default (no-modifier) access?
...package. As a concrete example :
package ab;
class A {
protected void foo() {}
void dd(){}
}
class C {
void aa(){
A a = new A();
a.foo(); //legal
a.dd(); //legal
}
}
package sub;
class D extends A{
void ac(){
foo(); //legal ..
dd(); //...
How to add custom validation to an AngularJS form?
... }
};
}]);
You can use it like this:
<input ng-model="foo" invalid-if="{fooIsGreaterThanBar: 'foo > bar',
fooEqualsSomeFuncResult: 'foo == someFuncResult()'}/>
Or by just passing in an expression (it will be given the default validation...
unit testing of private functions with mocha and node.js
...se the usage would be something like:
var rewire = require('rewire'),
foobar = rewire('./foobar'); // Bring your module in with rewire
describe("private_foobar1", function() {
// Use the special '__get__' accessor to get your private function.
var private_foobar1 = foobar.__get__('pri...
What is a Python equivalent of PHP's var_dump()? [duplicate]
...
I think the best equivalent to PHP's var_dump($foo, $bar) is combine print with vars:
print vars(foo),vars(bar)
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fo...
Return only string message from Spring MVC 3 Controller
...equestMapping(value="/controller", method=GET)
@ResponseBody
public String foo() {
return "Response!";
}
From: 15.3.2.6 Mapping the response body with the @ResponseBody annotation:
The @ResponseBody annotation [...] can be put on a method and indicates that the return type should be writte...
Javascript: best Singleton pattern [duplicate]
... return instance;
}
this.instance = this;
}
foo() {
// ...
}
}
console.log(new Singleton() === new Singleton());
(2) ES6 Version
class Singleton {
constructor() {
const instance = this.constructor.instance;
if (instance) {
...
LINQ: Select an object and change some properties without creating a new object
...Q expression example.
var query = someList.Select(x => { x.SomeProp = "foo"; return x; })
What this does is use an anonymous method vs and expression. This allows you to use several statements in one lambda. So you can combine the two operations of setting the property and returning the obje...