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What is the difference between == and equals() in Java?
...he same object, if their references are one and the same. Thus you will be testing for object equality and not functional equality.
Always remember to override hashCode if you override equals so as not to "break the contract". As per the API, the result returned from the hashCode() method for two o...
What are JavaScript's builtin strings?
..., strings "1", and discovered one beautiful method of RegExp object called test(). Its name can be assembled from all available characters, e.g. "t" and "e" from true, and "s" from false. I have created a string "test" and addressed this method using square brackets notation for regex literal /-/, c...
Should you always favor xrange() over range()?
...fixer: idioms
RefactoringTool: Skipping implicit fixer: ws_comma
--- range_test.py (original)
+++ range_test.py (refactored)
@@ -1,7 +1,7 @@
for x in range(20):
- a=range(20)
+ a=list(range(20))
b=list(range(20))
c=[x for x in range(20)]
d=(x for x in range(20))
- e=xrange(...
Advantage of switch over if-else statement
...different area of the code, but now you have the opportunity to reuse this test. You also have more options for how to solve it. You could use std::set, for example:
bool RequiresSpecialEvent(int numError)
{
return specialSet.find(numError) != specialSet.end();
}
I'm not suggesting that thi...
Check if a string matches a regex in Bash script
...
You can use the test construct, [[ ]], along with the regular expression match operator, =~, to check if a string matches a regex pattern.
For your specific case, you can write:
[[ $date =~ ^[0-9]{8}$ ]] && echo "yes"
Or more a accu...
How to properly compare two Integers in Java?
...d a numeric type (int, long etc) the wrapper type value is unboxed and the test is applied to the primitive values involved.
This occurs as part of binary numeric promotion (JLS section 5.6.2). Look at each individual operator's documentation to see whether it's applied. For example, from the docs ...
How do I programmatically force an onchange event on an input?
...ey're extremely rare.
Rather, you would do this:
document.getElementById("test").onchange()
Look here for more options:
http://jehiah.cz/archive/firing-javascript-events-properly
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Symfony 2 EntityManager injection in service
...anymore. According to the documentation You would pass in:
services:
test.common.userservice:
class: Test\CommonBundle\Services\UserService
arguments: [ "@doctrine.orm.entity_manager" ]
And then they would be available in the order they were listed via the arguments (if ther...
How to mkdir only if a directory does not already exist?
...ady exist, in which case I do not want to do anything. So I want to either test to see that the directory does not exist, or suppress the "File exists" error that mkdir throws when it tries to create an existing directory.
...
Call js-function using JQuery timer
...window.setInterval(yourfunction, 10000);
function yourfunction() { alert('test'); }
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