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Array vs. Object efficiency in JavaScript
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The short version: Arrays are mostly faster than objects. But there is no 100% correct solution.
Update 2017 - Test and Results
var a1 = [{id: 29938, name: 'name1'}, {id: 32994, name: 'name1'}];
var a2 = [];
a2[29938] = {id: 29938, name: 'name1'};
a2[32994] = {id: 32994, name: 'name1'};
var o =...
Resize a large bitmap file to scaled output file on Android
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Justin answer translated to code (works perfect for me):
private Bitmap getBitmap(String path...
How do I check if an element is really visible with JavaScript? [duplicate]
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+100
For the point 2.
I see that no one has suggested to use document.elementFromPoint(x,y), to me it is the fastest way to test if an e...
Best way to serialize an NSData into a hexadeximal string
...onversion:
BenchMark (mean time for a 1024 bytes data conversion repeated 100 times):
Dave Gallagher : ~8.070 ms
NSProgrammer : ~0.077 ms
Peter : ~0.031 ms
This One : ~0.017 ms
@implementation NSData (BytesExtras)
static char _NSData_BytesConversionString_[512] = "000102030405...
App Inventor 2 SQLite 拓展：超流行兼容主流SQL语法的迷你本地数据库引擎 ...
...工作，因此不会阻塞主 UI 线程。这对于在可能需要超过 100 毫秒左右的操作期间获得良好的用户体验非常重要。阻塞主 UI 线程将使您的应用程序看起来“冻结”并变得无响应，用户不喜欢这样。
当您需要执行需要一段时间的数...
Convert unix time to readable date in pandas dataframe
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JeffJeff
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Recommended SQL database design for tags or tagging [closed]
...entifier and if you run out of space in 2nd column which contains lets say 100 items create another row.
Now while searching for items for a tag it will be super fast.
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count vs length vs size in a collection
... I'd expect something else here. E.g. a UTF-16 string may have a length of 100 characters, but as every character is composed out of two byte, I'd expect size to be 200.
count() is very unusual. Objective-C uses count for the number of elements in an array. One might argue if an array has a length ...
Asynchronous Process inside a javascript for loop [duplicate]
...lution works. For example: function asycronouseProcess(fn){ setTimeout(fn, 100);}
– ZER0
Nov 21 '17 at 21:18
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SQL JOIN - WHERE clause vs. ON clause
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@FistOfFury Sql Server uses a query optimizer procedure that compiles and evaluates your code to produce the best execution plan it can. I...