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Specifying rails version to use when creating a new application
...option to create a new application using an older version of Rails.
rails _2.1.0_ new myapp
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Why do we need virtual functions in C++?
...s to more general). Visa-versa you need an explicit cast, usually a dynamic_cast. Anything else - very prone to undefined behavior so make sure you know what you're doing. To the best of my knowledge, this has not changed since before even C++98.
– Steve314
Jun...
Detect blocked popup in Chrome
...code I use for cross-browser detection, without the Chrome part.
function _hasPopupBlocker(poppedWindow) {
var result = false;
try {
if (typeof poppedWindow == 'undefined') {
// Safari with popup blocker... leaves the popup window handle undefined
result = t...
Specify JDK for Maven to use
...r a single invocation of maven?
Temporarily change the value of your JAVA_HOME environment variable.
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Detect network connection type on Android
...er cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
return cm.getActiveNetworkInfo();
}
/**
* Check if there is any connectivity
* @param context
* @return
*/
public static boolean isConnected(Context context){
Networ...
jQuery AJAX file upload PHP
...ript to look like this:
$('#upload').on('click', function() {
var file_data = $('#sortpicture').prop('files')[0];
var form_data = new FormData();
form_data.append('file', file_data);
alert(form_data);
$.ajax({
url: 'uploa...
JavaScript pattern for multiple constructors
... b= 'some default value';
if (typeof(a)==='string')
this._constructInSomeWay(a, b);
else if (a instanceof MyType)
this._constructInSomeOtherWay(a, b);
}
You can also access arguments as an array-like to get any further arguments passed in.
If you need more complex ar...
Is it safe to push_back an element from the same vector?
If the second push_back causes a reallocation, the reference to the first integer in the vector will no longer be valid. So this isn't safe?
...
How do you programmatically set an attribute?
...t:
>>> help(setattr)
Help on built-in function setattr in module __builtin__:
setattr(...)
setattr(object, name, value)
Set a named attribute on an object; setattr(x, 'y', v) is equivalent to
``x.y = v''.
Edit: However, you should note (as pointed out in a comment) that you...
Transpose/Unzip Function (inverse of zip)?
...
You could also use izip_longest
– Marcin
Sep 26 '13 at 16:52
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