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Mongodb Explain for Aggregation framework
...},
{ $match: {$or: [{"Tags._id":"tag1"},{"Tags._id":"tag2"}]}},
{ $group: {
_id : "$_id",
count: { $sum:1 }
}},
{$sort: {"count":-1}}
],
{
explain:true
}
)
An important consideration with the Aggregation Framework is that an index can only be used to fet...
All falsey values in JavaScript
...e confusion due to the underlying differences. They effectively form three groups:
false, 0, -0, "", '' all match each other with ==
e.g. false == "", '' == 0 and therefore 4/2 - 2 == 'some string'.slice(11);
null, undefined match with ==
e.g. null == undefined but undefined != false
It's ...
Repeater, ListView, DataList, DataGrid, GridView … Which to choose?
...each of them and see the differences for yourself
ListView (note the edit,group,insert ,layout)
AlternatingltemTemplate
EditltemTemplate
EmptyDataTemplate
EmptyltemTemplate
GroupSeparatorTemplate
GroupTemplate
lnsertltemTemplate
ItemSeparatorTemplate
ItemTemplate
LayoutTemplate
SelectedltemTempl...
Which @NotNull Java annotation should I use?
...ult "{javax.validation.constraints.NotNull.message}";
Class<?>[] groups() default { };
Class<? extends Payload>[] payload() default {};
@Target({ METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER })
@Retention(RUNTIME)
@Documented
@interface List {
No...
Most efficient way to store thousand telephone numbers
....
To recap: the first 17 bits are the common prefix, the subsequent 1000 groups of 17 bits are the last five digits of each number stored in ascending order.
In total we're looking at 2128 bytes for the 1000 numbers, or 17.017 bits per 10-digit telephone number.
Search is O(log n) (binary search...
Wrap a delegate in an IEqualityComparer
...92
x: 655632802
x: 1206819377
Hmm, that didn't work, did it?
What about GroupBy? Let's try that:
var grouped = values.GroupBy(x => x, comparer);
foreach (IGrouping<Value> g in grouped)
{
Console.WriteLine("[KEY: '{0}']", g);
foreach (Value x in g)
{
Console.WriteLin...
What algorithm can be used for packing rectangles of different sizes into the smallest rectangle pos
...ers the items in non-increasing width and then divides the items into five groups, each with width in the range (1/2, 1], (1/3,1/2], (1/4,1/3], (1/5,1/4], (0,1/5]. The strip is also divided into five regions R1, ··· , R5. Basically, some items of width in the range (1/i+1, 1/i], for 1 <= i <...
OSGi, Java Modularity and Jigsaw
...used by Ceylon (ceylonlang.org). See this thread on the Ceylon user forum: groups.google.com/forum/?hl=de#!topic/ceylon-users/RmDskLDNkug
– OlliP
Oct 24 '13 at 16:00
...
How do I make a textarea an ACE editor?
... should only be updated on form.submit event no? Also, according to this: groups.google.com/group/ace-discuss/browse_thread/thread/… There is no support for textarea replacement. Your answer is then the good one. Thx.
– Damien
Dec 26 '11 at 22:08
...
When to use nested classes and classes nested in modules?
...A::B.new
The advantages are the same as those for modules: encapsulation, grouping code used in only one place, and placing code closer to where it is used. A large project might have one outer module that occurs over and over in each source file and contains a lot of class definitions. When the va...