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What is tail recursion?
...lts in the last statement being in the form of (return (recursive-function params)). Basically, the return value of any given recursive step is the same as the return value of the next recursive call.
The consequence of this is that once you are ready to perform your next recursive step, you don't ...
Print string to text file
...igher you can use {} instead of {0}
In Python3, there is an optional file parameter to the print function
with open("Output.txt", "w") as text_file:
print("Purchase Amount: {}".format(TotalAmount), file=text_file)
Python3.6 introduced f-strings for another alternative
with open("Output.txt"...
Can I use Objective-C blocks as properties?
...py) void (^simpleBlock)(void);
@property (nonatomic, copy) BOOL (^blockWithParamter)(NSString *input);
If you are going to be repeating the same block in several places use a type def
typedef void(^MyCompletionBlock)(BOOL success, NSError *error);
@property (nonatomic) MyCompletionBlock completio...
How can I merge properties of two JavaScript objects dynamically?
...ites obj1's values with obj2's and adds obj2's if non existent in obj1
* @param obj1
* @param obj2
* @returns obj3 a new object based on obj1 and obj2
*/
function merge_options(obj1,obj2){
var obj3 = {};
for (var attrname in obj1) { obj3[attrname] = obj1[attrname]; }
for (var attrnam...
Using an ORM or plain SQL? [closed]
...ems to discuss is basic state-management. This entire stack of frameworks (JSF, JPA, etc) is based on Java beans get/set methods. This is a TON of boilerplate for every table, for every column and ... here's the real anti-pattern: Just to expose every field as if it were public. In effect, having a ...
How do I use disk caching in Picasso?
...soInstance = null;
/**
* PicassoCache Constructor
*
* @param context application Context
*/
private PicassoCache (Context context) {
Downloader downloader = new OkHttpDownloader(context, Integer.MAX_VALUE);
Picasso.Builder builder = new Picasso.Builder...
How to add hyperlink in JLabel?
...htmlIfy(String s) {
return HTML.concat(s).concat(HTML_END);
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new JLabelLink().setVisible(true);
...
How can I do something like a FlowLayout in Android?
... measureChild(child, widthMeasureSpec, heightMeasureSpec);
LayoutParams lp = (LayoutParams) child.getLayoutParams();
spacing = mHorizontalSpacing;
if (lp.horizontalSpacing >= 0)
{
spacing = lp.horizontalSpacing;
}
if (growHeight &...
How to get image height and width using java?
... provides an early exit:
/**
* Gets image dimensions for given file
* @param imgFile image file
* @return dimensions of image
* @throws IOException if the file is not a known image
*/
public static Dimension getImageDimension(File imgFile) throws IOException {
int pos = imgFile.getName().la...
URL to load resources from the classpath in Java
...^\\.]+" );
/**
* Call this method with your handlerclass
* @param handlerClass
* @throws Exception
*/
public static void add( Class<? extends URLStreamHandler> handlerClass ) throws Exception
{
if ( handlerClass.getSimpleName().equals( "Handler" ) )
...