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Array slicing in Ruby: explanation for illogical behaviour (taken from Rubykoans.com)
...ents themselves):
:peanut :butter :and :jelly
0 1 2 3 4
4 is still within the array, just barely; if you request 0 elements, you get the empty end of the array. But there is no index 5, so you can't slice from there.
When you do index (like array[4]), you are ...
How many files can I put in a directory?
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21 Answers
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Adding a new array element to a JSON object
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242
JSON is just a notation; to make the change you want parse it so you can apply the changes to ...
App装到手机上就"失忆"？关于Activity生命周期的7个硬核问答 - A...
...一个台阶。
Q1: Activity生命周期到底是什么？App Inventor 2里有对应的概念吗？
A: Activity是Android系统中最基本的UI容器单位，你可以理解为一个"屏幕页面"。Android系统对每个Activity都有一套严格的状态管理机制，从创建到...
Use dynamic variable names in JavaScript
...vation Object).
So if you create variables like this:
var a = 1,
b = 2,
c = 3;
In the Global scope (= NO function context), you implicitly write those variables into the Global object (= window in a browser).
Those can get accessed by using the "dot" or "bracket" notation:
var name = w...
How to decode Unicode escape sequences like “\u00ed” to proper UTF-8 encoded characters?
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Try this:
$str = preg_replace_callback('/\\\\u([0-9a-fA-F]{4})/', function ($match) {
retur...
Timeout a command in bash without unnecessary delay
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23 Answers
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ASP.NET Web API OperationCanceledException when browser cancels the request
...oads a page, it makes one or more ajax requests, which hit ASP.NET Web API 2 controllers. If the user navigates to another page, before these ajax requests complete, the requests are canceled by the browser. Our ELMAH HttpModule then logs two errors for each canceled request:
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Empty arrays seem to equal true and false at the same time
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276
You're testing different things here.
if (arr) called on object (Array is instance of Object...