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How to check iOS version?
...version as an indication of device or OS capabilities. There is usually a more reliable method of checking whether a particular feature or class is available.
Checking for the presence of APIs:
For example, you can check if UIPopoverController is available on the current device using NSClassFromS...
Way to go from recursion to iteration
.../ Push other objects on the stack as needed.
...
}
Note: if you have more than one recursive call inside and you want to preserve the order of the calls, you have to add them in the reverse order to the stack:
foo(first);
foo(second);
has to be replaced by
stack.push(second);
stack.push(first...
Get keys from HashMap in Java
...
A HashMap contains more than one key. You can use keySet() to get the set of all keys.
team1.put("foo", 1);
team1.put("bar", 2);
will store 1 with key "foo" and 2 with key "bar". To iterate over all the keys:
for ( String key : team1.keySet...
Algorithm for creating a school timetable
...e these constraints and goals into MAXSAT. MAXSAT algorithms are generally more reliable than genetic algorithms, but you may have clause explosion due to goals like the math classes should be spread out over the week.
– Jules
May 4 '10 at 1:41
...
How can you do anything useful without mutable state?
...t just setting up all kinds of boundaries to purposefully make programming more difficult. My point of view, you're just experiencing the Blub paradox.
I was skeptical at first, but I jumped on the functional programming train a few years ago and fell in love with it. The trick with functional prog...
How do I get around type erasure on Scala? Or, why can't I get the type parameter of my collections?
...st-API, which is deprecated as of Scala 2.10. Please see answers below for more current solutions.
Scala was defined with Type Erasure because the Java Virtual Machine (JVM), unlike Java, did not get generics. This means that, at run time, only the class exists, not its type parameters. In the exam...
How can I change the color of a part of a TextView?
...
Spannable is more flexible:
String text2 = text + CepVizyon.getPhoneCode() + "\n\n"
+ getText(R.string.currentversion) + CepVizyon.getLicenseText();
Spannable spannable = new SpannableString(text2);
spannable.setSpan(new Fo...
C++ code file extension? .cc vs .cpp [closed]
...ugh for a curious and mindful programmer. I'd like the answer on this page more since it has more detailed explanations.
– Novin Shahroudi
Oct 25 '17 at 7:26
...
Rails extending ActiveRecord::Base
...rt::Concern (Preferred)
Read the ActiveSupport::Concern documentation for more details.
Create a file called active_record_extension.rb in the lib directory.
require 'active_support/concern'
module ActiveRecordExtension
extend ActiveSupport::Concern
# add your instance methods here
def f...
Detecting request type in PHP (GET, POST, PUT or DELETE)
...ETHOD'] === 'POST') {
// The request is using the POST method
}
For more details please see the documentation for the $_SERVER variable.
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