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Why does Java switch on contiguous ints appear to run faster with added cases?
...de into assembly, the tableswitch instruction does not always result in an array of pointers: sometimes the switch table is transformed into what looks like a lookupswitch (similar to an if/else if structure).
Decompiling the assembly generated by the JIT (hotspot JDK 1.7) shows that it uses a succ...
Is object empty? [duplicate]
...t with non-enumerable properties and Object.keys will just return an empty array... Object.getOwnPropertyNames returns an array containing all the own properties of an object, even if they aren't enumerable.
– Christian C. Salvadó
Feb 14 '11 at 16:11
...
How does the algorithm to color the song list in iTunes 11 work? [closed]
...similar colors and then find the largest bucket.
DominantColorSimple[pixelArray_] :=
Module[{buckets},
buckets = Gather[pixelArray, ColorDistance[#1,#2] < .1 &];
buckets = Sort[buckets, Length[#1] > Length[#2] &];
RGBColor @@ Mean @ First @ buckets
]
...
How are virtual functions and vtable implemented?
... * is the first 4 bytes of the object, and the vtbl contents are simply an array of member pointers there (generally in the order they were declared, with the base class's first). There are of course other possible layouts, but that's what I've generally observed.
class A {
public:
virtual int ...
PostgreSQL: Difference between text and varchar (character varying)
...
There is no difference, under the hood it's all varlena (variable length array).
Check this article from Depesz: http://www.depesz.com/index.php/2010/03/02/charx-vs-varcharx-vs-varchar-vs-text/
A couple of highlights:
To sum it all up:
char(n) – takes too much space when dealing wi...
Print second last column/field in awk
...them back in afterwards
a autosplit mode – split input lines into the @F array. Defaults to splitting on whitespace
e execute the perl code
The @F autosplit array starts at index [0] while awk fields start with $1.
$#F is the number of elements in @F
...
Passing enum or object through an intent (the best solution)
I have an activity that when started needs access to two different ArrayLists. Both Lists are different Objects I have created myself.
...
Intersection of two lists in Bash
...
There is another Stackoverflow question "Array intersection in bash," which is marked as a duplicate of this. It's not quite the same, in my opinion, as that question talks about comparing two bash arrays, while this question focuses on bash files. A one-line answ...
AngularJS : automatically detect change in model
...to true, Angular will instead "shallow" watch the object for changes. For arrays this means comparing the array items, for object maps this means watching the properties. So this should do what you want:
$scope.$watch('myModel', function() { ... }, true);
Update: Angular v1.2 added a new method...
Are there any SHA-256 javascript implementations that are generally considered trustworthy?
...Buffer = await crypto.subtle.digest('SHA-256', msgBuffer);
// convert ArrayBuffer to Array
const hashArray = Array.from(new Uint8Array(hashBuffer));
// convert bytes to hex string
const hashHex = hashArray.map(b => ('00' + b.toString(16)).slice(-2)).join('');
...