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What are the best practices to follow when declaring an array in Javascript?
...n array with just one pre-specified number element in it!
Using [] is actually more efficient, and safer too! It's possible to overwrite the Array constructor and make it do odd things, but you can't overwrite the behaviour of [].
Personally, I always use the [] syntax, and similarly always use {...
ruby system command check exit code
...d execution fails.
system("unknown command") #=> nil
system("echo foo") #=> true
system("echo foo | grep bar") #=> false
Furthermore
An error status is available in $?.
system("VBoxManage createvm --invalid-option")
$? #=> #<Process::Status: pid 9...
Why are arrays of references illegal?
...question about standard I can cite the C++ Standard §8.3.2/4:
There shall be no references to references, no arrays of references, and no pointers to references.
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disable textbox using jquery?
... value = $(this).val();
if(value == 'x'){
enableInput('foo'); //with class foo
enableInput('bar'); //with class bar
}else{
disableInput('foo'); //with class foo
disableInput('bar'); //with class bar
}
});
});
...
Adding console.log to every function automatically
...there a way to make any function output a console.log statement when it's called by registering a global hook somewhere (that is, without modifying the actual function itself) or via some other means?
...
Why does git revert complain about a missing -m option?
...
By default git revert refuses to revert a merge commit as what that actually means is ambiguous. I presume that your HEAD is in fact a merge commit.
If you want to revert the merge commit, you have to specify which parent of the merge you want to consider to be the main trunk, i.e. what you want...
filter items in a python dictionary where keys contain a specific string
..._string not in key:
continue
# do something
However if you realllly want something to let you iterate through a filtered dict then I would not do the two step process of building the filtered dict and then iterating through it, but instead use a generator, because what is more pythonic...
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.
...
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(); //...
What is choice_set in this Django app tutorial?
...jango's ORM follows the relationship backwards from Question too, automatically generating a field on each instance called foo_set where Foo is the model with a ForeignKey field to that model.
choice_set is a RelatedManager which can create querysets of Choice objects which relate to the Question i...